Are there stars so hot they would appear black to the human eye? |
- Are there stars so hot they would appear black to the human eye?
- Why does an atom need a neutron?
- If rapidly cooling a metal increases its hardness, does the speed at which it's cooled always affect the end result (in terms of hardness)?
- Would a person with higher blood pressure bleed out faster than a person with lower blood pressure?
- Why is desert sand more fine compared to beach sand?
- Does the rotation of the Earth effect the movement of plates?
- ISS Radiation shielding which perform better Polyethylene, Kevlar, Plastic or water?
- Do pirhanas have pstrong redatory responses even without the presence of blood in their water?
- Is blue flame hotter than red/yellow flame?
- How do know so much about dinosaurs’ diets?
- What exactly does diesel do when spilled on asphalt?
- How early does the brain start to flip images we see right side up?
- What's the difference between a panic attack and a nervous breakdown?
- What is the phase composition of water when heated isobarically through the triple point? (state function)
- Why is the H/H blood group more common in India compared to the rest of the world?
- Chernobyl safetiness today. Are there any studies?
- Will a piece of metal rust faster when water is running over it, or with water resting on it?
- Do humans have symbiotic gut amoebas?
- Can you layer sun protection products and is their SP factor cumulative?
| Are there stars so hot they would appear black to the human eye? Posted: 13 Jul 2018 01:36 PM PDT Since stars are almost blackbodies, are there known stars so hot that their blackbody radiation completely falls into the UV wavelenghts so they emit no visible light at all? And if there aren't, would they be theoretically possible? [link] [comments]  |
| Why does an atom need a neutron? Posted: 13 Jul 2018 10:28 AM PDT |
| Posted: 14 Jul 2018 07:13 AM PDT I was reading about how a vacuum furnace works and the wiki page talked about how the main purpose is to keep out oxygen to prevent oxidation.... one point talked about using argon in situations where the metal needs to be rapidly cooled for hardness. It made me wonder: does cooling a melted metal faster than the "normal" rate give it a higher hardness? For example, if I melted steel in a vacuum furnace, and then flooded the space with extremely cold argon (still a gas, let's say -295 degrees F), would that change the properties of the metal as compared to doing the exact same thing but using argon at room temp? [link] [comments]  |
| Would a person with higher blood pressure bleed out faster than a person with lower blood pressure? Posted: 14 Jul 2018 03:13 AM PDT |
| Why is desert sand more fine compared to beach sand? Posted: 13 Jul 2018 11:11 PM PDT |
| Does the rotation of the Earth effect the movement of plates? Posted: 13 Jul 2018 10:36 PM PDT Might be a stupid question, but recently I've been wondering about a scenario where the earth spins backwards. The Coriolis effect effects the air and ocean currents, but does it effect the mantle currents? If there was an alternate earth that spun in a different way from ours, would its continents look different at all? [link] [comments]  |
| ISS Radiation shielding which perform better Polyethylene, Kevlar, Plastic or water? Posted: 14 Jul 2018 06:12 AM PDT |
| Do pirhanas have pstrong redatory responses even without the presence of blood in their water? Posted: 14 Jul 2018 06:05 AM PDT I know, like sharks, pirhanas are really good at detecting the presence of blood in their water, and react very strongly to it, but let's say I want to cross a river which has pirhanas in it, will they attack me if I have no cuts/any « blood leak » anywhere on my body? I guess they will, but at what point? Also, sorry for any wrong phrases in the title, it sounds wrong but I couldn't word it better [link] [comments]  |
| Is blue flame hotter than red/yellow flame? Posted: 13 Jul 2018 09:10 PM PDT I understand that blue light is higher energy than red light because it has higher frequency, E = hf. But in a wood fire, the flame is color red/yellow. But a gas lighter is bluish color near source and reddish/yellow near the end of flame. Does the color of flame depend only on Material in combustion? Or does actual color show which flame is hotter. For example, if you where shown three fires, one with red, one with yellow and one with blue flame, which one would you rather not touch? Sorry bad example, thanks in advance. Edit: But isnt heat just infrared radiation? So color shouldnt matter? [link] [comments]  |
| How do know so much about dinosaurs’ diets? Posted: 13 Jul 2018 09:02 PM PDT With a bunch of bones we have found out quite a bit. How do we know the things they ate? [link] [comments]  |
| What exactly does diesel do when spilled on asphalt? Posted: 13 Jul 2018 09:20 PM PDT So I work at a marina and recently somebody spilled diesel in one of the storage warehouses. They didn't bother cleaning it up and it sat in puddles for about 24 hours. When it was finally noticed and mopped up, the asphalt underneath the puddles was soft. Now we have to shovel out the soft asphalt and dispose of it in a safe manner since I assume its soaked in diesel. My question is why did the diesel liquify the asphalt? [link] [comments]  |
| How early does the brain start to flip images we see right side up? Posted: 14 Jul 2018 04:17 AM PDT Most diagrams of the eye, like this one, will show the image getting flipped after passing through the lens of your eye. This is rectified by the brain flipping what you see right side up when being processed. Do we know how early on in a persons life this process begins? [link] [comments]  |
| What's the difference between a panic attack and a nervous breakdown? Posted: 14 Jul 2018 12:09 AM PDT Was told to try posting this here, already got pretty sufficient answers from r/askreddit [link] [comments]  |
| Posted: 13 Jul 2018 09:34 PM PDT The triple point is the temperature and pressure at which solid, liquid, and vapor may exist in equilibrium with one another. However, at this pressure and temperature there are still infinite values of specific enthalpy for this 3-phase mixture, because it requires heat to melt/vaporize the components. If we are heating ice at 611.2 Pa, then we can define the enthalpy of pure ice at 611.2 Pa and 273.16 K to be some value H. If we add heat until it is completely vapor, then the pressure will still be 611.2 Pa and the temperature will be 273.16 K, but the enthalpy will be some value H + ΔH. At any given enthalpy between H and H + ΔH, there will be 3 phases in equilibrium - solid, liquid, and vapor. I'd like to figure out the composition (i.e. %solid, %liquid, %vapor) as a function of enthalpy between these two values and I'm very much struggling with this. Does anybody have insight into this? I'm presuming that at first, ~100% of the added heat goes into melting the solid and as the amount of solid approaches zero, ~100% of the added heat goes into vaporizing the liquid. What happens in the middle is much more complicated. I made a graph of what I think it would look like, but this definitely isn't a state function by any means. If somebody could give me an equation or an article about this, I'd be super grateful. Thanks! To add clarity, it would be equivalent to calculating composition as you move left-to-right on the triple point line of this plot: [link] [comments]  |
| Why is the H/H blood group more common in India compared to the rest of the world? Posted: 13 Jul 2018 11:14 PM PDT I read on wikipedia that the percentage of people with the Bombay blood type is 0.0004% and in India it is about 0.01%. [link] [comments]  |
| Chernobyl safetiness today. Are there any studies? Posted: 14 Jul 2018 02:49 AM PDT Hey guys, I was wondering if there are any studies about safetiness of Chernobyl today. [link] [comments]  |
| Will a piece of metal rust faster when water is running over it, or with water resting on it? Posted: 13 Jul 2018 02:43 PM PDT Assuming no edge effects where the water, metal, and air meet, would metal fully submerged in water rust faster in a water current or in stagnant water? Thanks! [link] [comments]  |
| Do humans have symbiotic gut amoebas? Posted: 13 Jul 2018 09:19 PM PDT We have a vast gut microbiome with beneficial gut bacteria, archaea, fungi and viruses. Are there any non parasitic amoebas in the gut and help us? Are there any other organisms that also live in our guts and help us like nematodes? [link] [comments]  |
| Can you layer sun protection products and is their SP factor cumulative? Posted: 13 Jul 2018 11:15 PM PDT |
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