What happens to water when it freezes and can't expand? |
- What happens to water when it freezes and can't expand?
- What is the reason for our irrational disgust of insects and arachnids? Were humans often poisoned-killed by them while we evolved?
- Why is it recommended to eat a lot of fruit, but it is not recommended to eat a lot non-fruit sweet snacks? Is fructose better than other kinds of sugar?
- Is arcing a more efficient way to transfer electricity versus a conductive wire? Ignoring the obvious safety concerns, could we have arc towers instead of power lines?
- Why does 100°C water feel so much hotter, more painful, and cause more damage than 177°C air?
- Does chlorine that settles in to ground when irrigating lawns or draining swimming pools degrade into something else, or remain unchanged?
- What exactly happens in fission and fusion reactions? and how are fission chain reactions sustained?
- How does mercury form amalgams?
- Where does all the chlorine we have in the HCl acid in our stomachs come from?
- Why does this problem not intuitively make sense?
- If stars in a galaxy increase in velocity the further they are from the center, why do galaxies have spirals? Wouldn't spiral arms indicate slower speeds as you approach the edges of a galaxy?
- If I move both my index fingers at once, am I sending one signal to both hands, or am I sending 2 individual signals? Is there a signal queue?
- Do any animals show appreciation for music?
- If you were able to cool plutonium to 0 kelvin, would it stop emitting alpha radiation?
- We have thousand separator for big numbers (eg: 100,000,000) but why is there no separator for very small decimal numbers?
- Is primitive streak/ primitive node linked in any way to coccyx bone?
- Where do river-spawning, migratory fish exist? Are they only in cold climates?
- How was velocity and position measured on a continuing basis in Cassini? What were the reference objects and were there several?
- [Engineering] Tempering is known to increase the toughness of steels, but why does it work? How does it operate on a molecular level?
- What is the most populous mammal on Earth?
- Before nuclear fission/fusion was discovered, what did people think powered the sun?
- What dinosaur species may have witnessed or been first impacted by the Chicxulub crater?
- MHD. How do current sheets form?
- Why are we told to cover our mouth with a wet cloth when there's a lot of smoke?
| What happens to water when it freezes and can't expand? Posted: 26 Jun 2017 04:16 AM PDT |
| Posted: 25 Jun 2017 07:54 AM PDT |
| Posted: 26 Jun 2017 01:22 AM PDT |
| Posted: 26 Jun 2017 02:13 AM PDT |
| Why does 100°C water feel so much hotter, more painful, and cause more damage than 177°C air? Posted: 25 Jun 2017 08:38 PM PDT For example, submerging your hand in boiling water will cause severe burns, but you can easily put your hand inside a hot oven for much longer than you could in the boiling water. Also, why does a soft rug at 0°C feel warmer to your bare feet than a concrete floor at the same temperature? [link] [comments]  |
| Posted: 26 Jun 2017 07:13 AM PDT I work in water utilities. 99% of residents in my city irrigate their lawns with city water, and we like chlorine to be 1.8-2.1 in this city. All run off from irrigation and when people drain pools and the like seeps into their lawn, and all water eventually makes it to the lake system. It's common knowledge here that chlorinated water once "filtered" through ones lawn removes nearly all the of the chlorine from the water by the time it makes its way back into our lake system. So my questions is, does all that chlorine sit in the ground unchanged? Or does it eventually degrade into something else? [link] [comments]  |
| What exactly happens in fission and fusion reactions? and how are fission chain reactions sustained? Posted: 26 Jun 2017 04:22 AM PDT I know the basics of fission and fusion with fission being the splitting of the atom and fusion being atoms combining. But as I am only 14 I don't have a major understanding of this topic but I really love physics and learning more so any answers would be greatly appreciated. Thanks in advance. [link] [comments]  |
| How does mercury form amalgams? Posted: 26 Jun 2017 06:04 AM PDT I would like to know more about how they are formed and how this compares to other types of bonding but the wikipedia page only says its an alloy but nothing about the process. My chemistry level is only at A-level. [link] [comments]  |
| Where does all the chlorine we have in the HCl acid in our stomachs come from? Posted: 24 Jun 2017 08:58 PM PDT |
| Why does this problem not intuitively make sense? Posted: 25 Jun 2017 11:08 PM PDT So here's a quick question about a fundamental math question I've never truly understood despite being able to work it out... Here it is: Say you have a 100 sided die (yeah, I know it's unrealistic), and you're going to roll this die 'x' amount of times until you roll a 1 (1/100 chance). Now you want to find out how many time you have to roll this to give you a 50% chance of rolling a 1 at any point in those rolls. Well, by doing a little bit of arithmetic, we can find that if you roll that die ~69 times, there's a 50% chance of rolling a 1. My question is what is the logic for this, and why do most people naturally think you'd have to roll it 50 times to get a 50% chance of getting a 1... We know that's wrong, but why would many intuitively think that is correct? If the question is confusing, please let me know and I'll try to clarify. [link] [comments]  |
| Posted: 26 Jun 2017 07:27 AM PDT I understand dark matter plays a role here, keeping the galaxy spinning as one like a dinner plate. Does this indicate the spirals form before enough dark matter appears? [link] [comments]  |
| Posted: 25 Jun 2017 10:11 PM PDT |
| Do any animals show appreciation for music? Posted: 25 Jun 2017 05:02 PM PDT |
| If you were able to cool plutonium to 0 kelvin, would it stop emitting alpha radiation? Posted: 25 Jun 2017 08:18 PM PDT |
| Posted: 26 Jun 2017 05:52 AM PDT I never realized how useful separator is for counting money until I met bitcoin. I can easily read thousands or millions of dollar value, but reading how much bitcoin I have is kinda hard. How much again is one satoshi? is it nine zero or ten zero before comma? then after looking at this satoshi btc converter site I realized that.. why's there no decimal separator like in thousand ? Edit : sorry if I put the wrong flair, first time asking here.. hehe [link] [comments]  |
| Is primitive streak/ primitive node linked in any way to coccyx bone? Posted: 26 Jun 2017 07:52 AM PDT Hi, I'm debating with muslim student of medicine, and he was telling me about common belief among some muslims that coccyx bone has been described by prophet Muhammad as special in embryo formation and indestructible. He quoted Hans Speman via this article http://www.nicheoftruth.org/pages/the_coccyx_bone.asp Questions: 1) I assume they are stretching the meaning of primitive streak/node to mean it is the same as coccyx bone, while coccyx is but a product. Could you point to some academic literature that explains why/why not it's a correct assertion? 2) He also claimed coccyx bone doesn't decompose. Is there any truth in it? Is it decomposing slower? Please also point to any literature here. Thanks [link] [comments]  |
| Where do river-spawning, migratory fish exist? Are they only in cold climates? Posted: 26 Jun 2017 07:51 AM PDT I've been reading about Patagonia's efforts to recover river environments, mostly in the US and Canada by lobbying for decommissioning and destruction of dams that affect fish that swim upriver from the ocean, such as salmon. I was wondering, do any species like these exist in hotter climates? Such as in Mexico or Brazil? My state in Mexico has 11 rivers and I believe 10 of them are dammed. Is this an issue only for salmon and these more northern and southern latitudes? Do any tropical species migrate like this? [link] [comments]  |
| Posted: 26 Jun 2017 06:50 AM PDT |
| Posted: 26 Jun 2017 12:00 AM PDT "Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys." (from wikipedia). I understand that metallurgists use high temperatures to increase the toughness/reduce fracturing. But why do higher temperatures lead to better elastic materials (like springs) and lower temperatures lead to better toughness (like hammers or screwdrivers). [link] [comments]  |
| What is the most populous mammal on Earth? Posted: 26 Jun 2017 05:36 AM PDT |
| Before nuclear fission/fusion was discovered, what did people think powered the sun? Posted: 25 Jun 2017 10:41 AM PDT |
| What dinosaur species may have witnessed or been first impacted by the Chicxulub crater? Posted: 26 Jun 2017 05:26 AM PDT So I am writing some fiction set at the very end of the Cretaceous and in a lot of Media T-rex and triceratops seem to be looking right at the impact but given that it hit near mexico - what poor species would have witnessed the meteor impact? [link] [comments]  |
| MHD. How do current sheets form? Posted: 26 Jun 2017 05:16 AM PDT Currently studying magnetic reconnection and my notes say that even in ideal MHD conditions there are current sheets formed between separate plasma region. I'd like to know process, not reconnection mind you, but the formation of the sheet. [link] [comments]  |
| Why are we told to cover our mouth with a wet cloth when there's a lot of smoke? Posted: 25 Jun 2017 07:14 PM PDT |
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