Disregarding big leaks, what is the main mechanisms for tires to lose pressure over time? Is it the valve? Or does air permeate through the rubber?

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• Disregarding big leaks, what is the main mechanisms for tires to lose pressure over time? Is it the valve? Or does air permeate through the rubber?
• Is it possible to orbit a planet/star at its escape velocity?
• How do we know how big neutron stars are?
• If a photon doesn't have a an anti- counterpart because it is a boson, does that mean that a Helium-4 atom also don't have a anti- counterpart?
• What do we know about the long-term risks of getting a flu shot every year?
• Does a mass current have the same gravitational field than a static line of mass?
• If I have an AC source with a current limiter, what is the minimum voltage required for current to pass through my body (hand to hand) and what current would be fatal?
• Would corium from a nuclear reactor meltdown (for example, in Chernobyl) present Cherenkov radiation if submerged in water?
• Are electrons farther in atoms with more protons?
• When you break/snap something, (i.e. String, a stick, a carrot) what is actually making the noise that we hear?
• How do firefighters determine the percentage of fire contained?
• Do planets reflect more or less light based on their composition?
• What is dark matter, and how is it relevant to our understanding of the universe?
• How do different wind speeds affect wildfires?

Disregarding big leaks, what is the main mechanisms for tires to lose pressure over time? Is it the valve? Or does air permeate through the rubber? Posted: 12 Oct 2017 04:12 AM PDT submitted by /u/rumborak [link] [comments]

Is it possible to orbit a planet/star at its escape velocity? Posted: 12 Oct 2017 05:13 AM PDT submitted by /u/Cipher216 [link] [comments]

How do we know how big neutron stars are? Posted: 12 Oct 2017 05:14 AM PDT I've heard they are around 20 km in diameter. But how on earth do we know this when they are so far away? Is it just a guess based on their mass? submitted by /u/ten_mile_river [link] [comments]

If a photon doesn't have a an anti- counterpart because it is a boson, does that mean that a Helium-4 atom also don't have a anti- counterpart? Posted: 12 Oct 2017 04:04 AM PDT In the newest episode of PBS Spacetime ( https://www.youtube.com/watch?v=OvgZqGxF3eo ) they called He-4 a boson because it has a total spin of 0. Does that mean that it doesn't have a anti particle counterpart? submitted by /u/SpantaX [link] [comments]

What do we know about the long-term risks of getting a flu shot every year? Posted: 12 Oct 2017 04:47 AM PDT Upfront disclaimer: I'm not an anti-vaxxer crazy person. I received all my vaccines as a kid and adult, and believe kids should get vaccinated for life threatening illnesses. That being said, what do we know about the long term risks of being vaccinated for the flu year after year? The CDC website states that the flu vaccine is 100% safe. Is this really true? How do they know this? Has anyone studied the long term effects of being vaccinated every year? What about the effects of thiomersal? And a few side questions: why does the CDC now recommend flu shots for everyone? It used to be recommended only for the elderly. Was it because of industry lobbying? Is the flu vaccine intended primarily to protect individuals, or is it only really effective when there's a critical mass of "herd immunity" in effect? How many people actually die of the flu every year? I personally don't know anyone who has died from the flu. submitted by /u/Goosebaby [link] [comments]

Does a mass current have the same gravitational field than a static line of mass? Posted: 12 Oct 2017 12:24 AM PDT In analogy to electromagnetism. A static line of charge creates a static electric field but a moving constant electrical current in the line creates a static magnetic field. I know there are possible gravitomagnetic theories but I'm not suggesting this kind of solutions. I'm asking if there is a difference between the gravitational field of a line with constant linear mass and a line of constant speed moving masses, according to standard theories (classical or GR). submitted by /u/MaoGo [link] [comments]

If I have an AC source with a current limiter, what is the minimum voltage required for current to pass through my body (hand to hand) and what current would be fatal? Posted: 12 Oct 2017 03:25 AM PDT submitted by /u/S3Ni0r42 [link] [comments]

Would corium from a nuclear reactor meltdown (for example, in Chernobyl) present Cherenkov radiation if submerged in water? Posted: 11 Oct 2017 11:24 PM PDT submitted by /u/MarsNirgal [link] [comments]

Are electrons farther in atoms with more protons? Posted: 11 Oct 2017 06:19 PM PDT Assuming that in a H atom there is 1 proton, the electron would be at "1" distance, close enough to gravitate around the proton but also not that close to fall into it. If we add one more proton, shouldn't the distance of the electron be multiplied by a constant? It couldn't just be at "1" distance... It would be attracted, right? Is this important in order to understand elements? submitted by /u/EmeraldTimer [link] [comments]

When you break/snap something, (i.e. String, a stick, a carrot) what is actually making the noise that we hear? Posted: 11 Oct 2017 08:04 AM PDT submitted by /u/username-confirmed [link] [comments]

How do firefighters determine the percentage of fire contained? Posted: 11 Oct 2017 03:49 PM PDT submitted by /u/NashtyBooker [link] [comments]

Do planets reflect more or less light based on their composition? Posted: 11 Oct 2017 06:08 PM PDT If (somehow) a planet were made by glass in the surface, wouldn't it reflect more light than a planet most made of some black material? submitted by /u/EmeraldTimer [link] [comments]

What is dark matter, and how is it relevant to our understanding of the universe? Posted: 11 Oct 2017 03:49 PM PDT submitted by /u/TheHeisenMandarine [link] [comments]

How do different wind speeds affect wildfires? Posted: 11 Oct 2017 03:27 PM PDT I was listening to NPR discussing the current wildfire situation in Napa, California and a recording clip mentioned how ~%20-%30 wind speed really bad for trying to contain the fire. Would slower wind speed cause the flame to essentially stagnate and burn out? Would higher wind speeds be able to kill off a wild fire? submitted by /u/hafuhafu [link] [comments]

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Would discovering that the universe was actually infinite or finite change anything regarding our understanding of physics?

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• Would discovering that the universe was actually infinite or finite change anything regarding our understanding of physics?
• Why rocket engine "exhaust pipe" is shaped like a bell rather than a nozzle?
• If hand sanitizer kills 99.99% of germs, then won't the surviving 0.01% make hand sanitizer resistant strains?
• Does the universe rotate?
• Is there anything physically unique about the visual part of the EM spectrum?
• If the CMB was released when it was cool enough for recombination to happen, how are different parts of CMB hotter than others?
• If space and time are relative, then doesn't the age of universe change depending on where you are?
• When and how did we learn that space is a vacuum?
• If just the amount of protons determine what kind of element an atom is, could we transform an element's atom into another by changing this amount? What are the problems and challanges in this?
• Is there a limit to how many atoms there can be in a molecule?
• At the very edge of an event horizon do photons have a velocity of 0?
• Can the Born probability rule be derived from the Shrodinger's Equation, or is it an additional postulate?
• If an asteroid passed through the 36,000km satellite oribtal plane, would it sweep through destroying satellites or is it likely to just pass through and not touch anything? How densely filled is this satellite region?
• Which animals/things crossed the Bering Strait from North America to Asia millions of years ago?
• What are Bose Einstein condensates?
• What burns during re-entry?
• What about vitamin C helps your immune system?
• How do microwaves vibrate water molecules if microwave waves are so much larger?
• Why do all stars almost look the same size when they are so far away and apart?
• Would it be possible to use a neutrino stream to send communications through Earth?
• When an ohm-meter shows a negative value, how was it determined?

Would discovering that the universe was actually infinite or finite change anything regarding our understanding of physics? Posted: 10 Oct 2017 05:26 PM PDT submitted by /u/XxRewirexX [link] [comments]

Why rocket engine "exhaust pipe" is shaped like a bell rather than a nozzle? Posted: 11 Oct 2017 02:47 AM PDT If you have a nozzle shape, the gass exiting will result in higher exhaust velocity, giving higher impulse. Then why they use bell - like form? Edit: typo submitted by /u/paulysch [link] [comments]

If hand sanitizer kills 99.99% of germs, then won't the surviving 0.01% make hand sanitizer resistant strains? Posted: 11 Oct 2017 07:00 AM PDT submitted by /u/ClF3FTW [link] [comments]

Does the universe rotate? Posted: 10 Oct 2017 04:15 PM PDT submitted by /u/chumchilla [link] [comments]

Is there anything physically unique about the visual part of the EM spectrum? Posted: 11 Oct 2017 06:51 AM PDT My understanding of the electromagnetic spectrum is that everything from radio waves to gamma rays are just electromagnetic waves with different wavelengths. Is there anything that makes the visual spectrum unique beyond just happening to be what our eyes evolved to see? I understand that some animals have the ability to see some ultraviolet light or have infrared detectors, but for the most part we all seem to see the same very narrow part of the spectrum. Is there any reason we couldn't just as easily see only UV light or see entirely in the IR spectrum? Going further, is there a reason we don't see radio waves (the sun puts these out, right?) Is there something physically unique about that narrow band of the electromagnetic spectrum? submitted by /u/yellowboat [link] [comments]

If the CMB was released when it was cool enough for recombination to happen, how are different parts of CMB hotter than others? Posted: 11 Oct 2017 05:09 AM PDT So I heard that the reason CMB is not perfectly smooth, is because when recombination happened, some places of the universe were sligthly denser, and therefore hotter. Here is what I have trouble with understanding. The recombination supposedly happened when matter became cool enough for electrons to be "absorbed" by atomic nucleus. This should mean that no matter the density, recombination will always happen at a specific temperature. Therefore the released blackbody radiation (CMB) should always be of the same temperature. Therefore the CMB should be perfectly smooth. If some places of the universe were hotter than others, the CMB should have just been released at a different time depending on location, but the temperature should be the same. submitted by /u/empire314 [link] [comments]

If space and time are relative, then doesn't the age of universe change depending on where you are? Posted: 10 Oct 2017 07:20 PM PDT For example, time moves slower on the surface of a black hole, meaning black holes are actually younger in their time than our time. Doesn't this apply to the universe too? submitted by /u/SyckTycket [link] [comments]

When and how did we learn that space is a vacuum? Posted: 11 Oct 2017 01:16 AM PDT I'm guessing that before the era of spaceflight scientists already knew about this, and they knew how to construct spaceships so that poor Laika or Gagarin wouldn't die. But when did we go from all of the ether story to actually knowing it's vacuum? submitted by /u/crazyGauss42 [link] [comments]

If just the amount of protons determine what kind of element an atom is, could we transform an element's atom into another by changing this amount? What are the problems and challanges in this? Posted: 11 Oct 2017 07:09 AM PDT Can we add or remove protons to change an element atom into another? I guess neutrons and electrons will then be handy for stability. Isn't this what happens in fusion or fission? Can we smash Hydrogen and Helium together to make Lithium? I know some elements are artificially made, so why we don't play with this and turn Cobalt into Iron or Gold into Platinum or Iridium, ecc.? Stability it's tricky? submitted by /u/SimoTRU7H [link] [comments]

Is there a limit to how many atoms there can be in a molecule? Posted: 11 Oct 2017 07:18 AM PDT submitted by /u/sciencesearcher [link] [comments]

At the very edge of an event horizon do photons have a velocity of 0? Posted: 11 Oct 2017 05:34 AM PDT At a location where if they were closer to singularity they would be pulled in and if they were any farther away they would escape. submitted by /u/homestar_ssbm [link] [comments]

Can the Born probability rule be derived from the Shrodinger's Equation, or is it an additional postulate? Posted: 11 Oct 2017 07:14 AM PDT submitted by /u/thetimujin [link] [comments]

If an asteroid passed through the 36,000km satellite oribtal plane, would it sweep through destroying satellites or is it likely to just pass through and not touch anything? How densely filled is this satellite region? Posted: 10 Oct 2017 02:59 PM PDT This article got me thinking. If it was passing a bit closer to Earth, would it be putting lots of satellites at risk? submitted by /u/blahehblah [link] [comments]

Which animals/things crossed the Bering Strait from North America to Asia millions of years ago? Posted: 10 Oct 2017 04:19 PM PDT To clarify, It's known that humans crossed the Bering Strait from Asia to North America, but I never considered what animals came from NA to Asia. Any and all answers are appreciated :) submitted by /u/55thebassman55 [link] [comments]

What are Bose Einstein condensates? Posted: 11 Oct 2017 06:52 AM PDT I vaguely heard something a bout this a while ago and asked my chem teacher, who said there was no 5th state of matter. Which cconfused me. What are they? submitted by /u/oblivionsieg [link] [comments]

What burns during re-entry? Posted: 10 Oct 2017 07:26 PM PDT I know that when something re-enters the atmosphere there is burning, but I want to know what is burning. In the case of a meteor, is the meteor burning or is the air around it burning and the heat is breaking apart the meteor, same question applies to shuttles and other space craft re-entry. If the air is burning then what in the air is burning? (Also is this a chemistry question?) submitted by /u/ShatteredParagon [link] [comments]

What about vitamin C helps your immune system? Posted: 10 Oct 2017 06:53 PM PDT There's vitamin supplements that are marketed to help you get better if you have a cold, but if your body is already fighting the bad stuff, how do we know if vitamin supplements are actually doing anything? submitted by /u/woialla [link] [comments]

How do microwaves vibrate water molecules if microwave waves are so much larger? Posted: 11 Oct 2017 01:33 AM PDT Bonus question, just how small, into ionising radiation does a wavelength have to be to start damaging cells, and how does it do it? submitted by /u/nighttarga [link] [comments]

Why do all stars almost look the same size when they are so far away and apart? Posted: 10 Oct 2017 01:58 PM PDT Follow up: Should not the suns ratio to the stars be diffrent? submitted by /u/smokeyandthebear [link] [comments]

Would it be possible to use a neutrino stream to send communications through Earth? Posted: 10 Oct 2017 05:37 PM PDT Would there be any advantage to it or are any form of neutrino detector to bulky or expensive? submitted by /u/mrpigpuncher [link] [comments]

When an ohm-meter shows a negative value, how was it determined? Posted: 11 Oct 2017 12:20 AM PDT I took some unexpected electrical measurements on the human body. I attached two metallic wrist straps to my arm, and clipped one lead of an ohm-meter to each strap. With dry wrist straps, I was expecting to get readings of around 1 MΩ. If I connected the meter one way, that's what I got. To my surprise, if I swapped the leads, the meter read around NEGATIVE 1 MΩ. Obviously, a negative resistance is impossible. I switched the multimeter to a volt-meter setting, and I was able to see around 50 mV across the two straps. The human body has bioelectric potentials, and I had managed to connect to two points that had different potentials. Obviously a simple attempt to measure resistance will be meaningless in this situation. I understand all that, but what I would like to understand is how the ohm-meter determined the negative value that it displayed. The classic Wheatstone bridge ohm-meter tries to zero the current flow across the bridge galvanometer, by adjusting a resistor. The lowest value that resistor can have is zero ohms, and if that still doesn't neutralize the current flow across the bridge... then what? I suspect that the multimeter isn't using a Wheatstone bridge after all, but what might be used in its place, I don't know. I also don't know whether that "negative resistance" value is expected to be meaningful. I did notice that it was roughly -1.0 times what I got when I swapped the leads. submitted by /u/aotus_trivirgatus [link] [comments]

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If you put a Garden in the ISS, Could you have infinite oxygen?

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• If you put a Garden in the ISS, Could you have infinite oxygen?
• How do blackouts work? Was the memory never recorded, never saved or deleted while sleeping?
• Why can you eat meats like beef and seafood raw/undercooked but not chicken?
• Is there a consensus in the pediatric community on the risk/benefits of adding sweeteners and pleasant flavorings to medication in terms of preventing the occurence of intoxications in children through self-medication?
• How do logic gates work physically?
• How quickly is stellar fusion depleting the hydrogen in the universe? When will there be more heavy elements than hydrogen?
• If hormonal contraception stops eggs being released, how do they eventually come out?
• Do non-human animals domesticate other animals?
• Do spiders make noise when moving or feeding?
• Are wild fires getting worse or are they "normal" statically speaking?
• How do scientists declare a species "extinct"? How can they prove there's not a handful still living in some remote area somewhere?
• Is there anything alive in the soil 100 feet below ground level?
• Why do spaceship shuttle launches always go straight up rather than a gradual up like an airplane?
• Why do some raindrops fall as “mist” and others are larger?
• What does it mean when someone "predicted a particle"?
• Why doesn’t air separate like other mixtures?
• How strong is a power plant generator magnet?
• Is there a reason why phone screens are made of glass and not something harder to crack, like plastic?
• How does the CMB (cosmic microwave background) map out the entire universe if the universe is 89.9 billion light years wide?
• Can a 2D plane (as in space not airplane) be tied into a knot (that can fold and bend in a 3D space) without the plane touching (intersecting) itself in any place?
• Why does facial hair tend to go gray sooner than head hair?

If you put a Garden in the ISS, Could you have infinite oxygen? Posted: 10 Oct 2017 04:40 AM PDT Because it can create oxygen and u can feed it with co2? submitted by /u/O5Beta [link] [comments]

How do blackouts work? Was the memory never recorded, never saved or deleted while sleeping? Posted: 09 Oct 2017 02:15 PM PDT submitted by /u/luigitrash [link] [comments]

Why can you eat meats like beef and seafood raw/undercooked but not chicken? Posted: 09 Oct 2017 10:33 PM PDT submitted by /u/peterthefatman [link] [comments]

Is there a consensus in the pediatric community on the risk/benefits of adding sweeteners and pleasant flavorings to medication in terms of preventing the occurence of intoxications in children through self-medication? Posted: 10 Oct 2017 04:12 AM PDT I'm sort of wondering here. And just to be clear, when I refer to self medication in children, I mean so in the context of accidental unsupervised self-medication (e.g.: "Little Sally reached out to the medicine cabinet while I was napping and drank that bottle of strawberry-flavored cough syrup" kind of thing). On the one hand, I notice that some pharmaceuticals will add a variety of edulcorants to child medicine, and even go so far as to make this a centerpiece of their sales strategy. On the other hand, some other child medication has no such flavorings or sweeteners and tastes thoroughly vile. On the gripping hand, while some other childrens medicine has flavorings, it seems these were designed as a compromise and taste "off", and might deserve such epithets as "grotesque grape, 'bominable banana, or horrible orange" ... I cannot remember specific names, but I'm sure we all recognize the ones I'm referring to from memory. Are these deliberately made gross to prevent self administration I have always wondered? So ... This brings me to my question. I understand there are benefits to making medicine palatable to children, and that there is a risk that palatable medicine might entice children to self administer, creating a risk for intoxication. There is a balance there. So ... is there a consensus as to where that balance should be or are we in the hands of a free for all where pharmas sort of "throw stuff and strategies to the wind", and see what sticks to the sales figures? submitted by /u/Gargatua13013 [link] [comments]

How do logic gates work physically? Posted: 10 Oct 2017 06:54 AM PDT I have a basic understanding of logic gates and how they operate such as and/or gates. But I am having a hard time finding out how they work physically. What kind of basic device(s) allow for two inputs to interact and "compare"? Please explain in basic circuit terms as this isn't something I am learning about but simply curious about. submitted by /u/IamWongg [link] [comments]

How quickly is stellar fusion depleting the hydrogen in the universe? When will there be more heavy elements than hydrogen? Posted: 09 Oct 2017 07:21 PM PDT Question in title submitted by /u/bangazord [link] [comments]

If hormonal contraception stops eggs being released, how do they eventually come out? Posted: 09 Oct 2017 02:50 PM PDT Most oral contraceptives stop eggs being released. But after you stop taking them, do they come out in gluts or staggered over a longer period of time? And of gluts, why aren't former contraceptive users more likely to have twins and multiple births? submitted by /u/Brumadier [link] [comments]

Do non-human animals domesticate other animals? Posted: 10 Oct 2017 03:01 AM PDT submitted by /u/TheSmellOfPurple [link] [comments]

Do spiders make noise when moving or feeding? Posted: 09 Oct 2017 08:45 PM PDT Every time I see a spider depicted in a movie or game, they make these weird grunting or scampering noises. Is this true or were they added for the viewers? submitted by /u/TurboTitan92 [link] [comments]

Are wild fires getting worse or are they "normal" statically speaking? Posted: 10 Oct 2017 02:15 AM PDT submitted by /u/SexualIntellect [link] [comments]

How do scientists declare a species "extinct"? How can they prove there's not a handful still living in some remote area somewhere? Posted: 10 Oct 2017 03:40 AM PDT submitted by /u/cavanaughnick [link] [comments]

Is there anything alive in the soil 100 feet below ground level? Posted: 09 Oct 2017 02:32 PM PDT Let's say you're drilling around 100' deep. Is there going to be any bacteria in the dirt/clay thats brought up? Is it completely sterile? submitted by /u/Goat_in_the_water [link] [comments]

Why do spaceship shuttle launches always go straight up rather than a gradual up like an airplane? Posted: 10 Oct 2017 03:00 AM PDT Why can't/is there a way that shuttles can take off like airplanes and then launch theirselves into orbit? It sounds like an easier job and less cost fighting against gravity going at a 45-75° angle rather than a pure 90° angle. submitted by /u/CipherWeston [link] [comments]

Why do some raindrops fall as “mist” and others are larger? Posted: 09 Oct 2017 06:05 PM PDT Please answer the question myself and my children couldn't figure out today.. submitted by /u/Tori216Tisler [link] [comments]

What does it mean when someone "predicted a particle"? Posted: 09 Oct 2017 06:53 PM PDT A lot of discussion about the Higgs Boson states that the particle had been predicted by Higgs et al. I've seen that phrase used for a few other particles. It makes sense to me that someone predicted Neptune, for instance, based on perturbations in Uranus' orbit. But it was not confirmed until we actually saw it. But how could one predict the existence of a particle? We've seen it's effects, right? But from what I understand, we haven't actually seen the Higgs Boson, only the things it broke down into? So how is that direct evidence? What am I missing here? submitted by /u/steve-reads-mail [link] [comments]

Why doesn’t air separate like other mixtures? Posted: 09 Oct 2017 04:38 PM PDT submitted by /u/CrouchingNarwal [link] [comments]

How strong is a power plant generator magnet? Posted: 10 Oct 2017 04:22 AM PDT Google is always so unhelpful when it comes to more advanced science questions. I already know how it works, I just want to know how strong they are generally. One of the big ones, like coal fired power plants have. Preferably in Teslas over Henrys or something, if you can. submitted by /u/SebastianScarlet [link] [comments]

Is there a reason why phone screens are made of glass and not something harder to crack, like plastic? Posted: 09 Oct 2017 04:14 PM PDT submitted by /u/demon-_-queen [link] [comments]

How does the CMB (cosmic microwave background) map out the entire universe if the universe is 89.9 billion light years wide? Posted: 09 Oct 2017 02:58 PM PDT What physical forces are in play? EDIT: want to know how the data was collected submitted by /u/Thisappismeth [link] [comments]

Can a 2D plane (as in space not airplane) be tied into a knot (that can fold and bend in a 3D space) without the plane touching (intersecting) itself in any place? Posted: 09 Oct 2017 08:59 AM PDT I know a 2D plane is always flat but in this instance it can fold and twist as many times as necessary as long as it doesn't touch itself. I have a picture that further clarifies what I mean and illustrates what I have already discovered for myself, I'll try to find a way to post it in the comments. Pardon my English, it's not my first language. submitted by /u/every-name-is-taken2 [link] [comments]

Why does facial hair tend to go gray sooner than head hair? Posted: 09 Oct 2017 04:48 PM PDT submitted by /u/suitelogic [link] [comments]

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