2008年12月9日 · Similar, but not identical. I might be wrong but I don't think you can get a blister from LN2; I get LN2 on my hands quite frequently (you'd think I learn, but no) and you certainly end up with dead skin and pain (and it hurts a LOT if you get enough of it on you) but I have so far never had a blister (I get my blisters from soldering instead).

2010年7月10日 · Hello. People always say that the space is 'cold', and I've always heared that on a satellite, the side facing the sun is really hot, while the dark side is very cold. What I don't understand is how can the dark side be cold if the heat it had couldn't escape in any way except radiation, which, to my understanding, is very small.

2005年9月16日 · Then I continued to heat the wax until the liquid wax ignited and started to burn. Usually the wick on the candle is only burning wax vapor. Then I proceeded to dump the burning hot candle wax into cold water to my surprise, a very exothermic process took place (basically a mini explosion.) Can anyone explain the chemical reason behind this.

2022年6月1日 · If it takes an hour for the metal roof to burn through, there is enough time for the firetrucks to get to the building and street. But if it takes only 10 minutes for the metal roof to burn through, then better to remove the entire roof and make it as open deck. It's all concrete floor and wall below it. The thin metal roof is roof of the 3rd ...

2014年3月21日 · Helium: doesn't form an oxide, so doesn't burn. Iron: does form an oxide, so will burn if the conditions are right. That's how an oxyacetylene cutitng torch works. (you may object that only one of those is a solid - but depending on the temperature and pressure they both could be either solid, liquid, or gas).

2012年5月27日 · 3. Is it better to use warm or cold gasoline for optimal energy efficiency? It is best to use gasoline at its recommended temperature range for optimal energy efficiency. Using gasoline that is too cold or too warm may lead to decreased energy output and potentially harm your engine. 4. How does gasoline's energy output change with temperature?

2016年1月16日 · I could imagine a chemical reaction that happens at low temperatures, but emits light directly from the reaction (instead of thermally induced emission in normal flames). No idea if you can get enough Chemiluminescence in a reaction of cold gases to make it visible. The two examples given there involve toxic substances.

2018年1月13日 · CCA (Cold Cranking Amps) is specified at 0°F, and CA (Cranking Amps) at 32°F with the ratio between them approximately 1.25:1 (for wet cell batteries - AGM batteries are a different sort of beast). Available cranking current falls with temperature; operation in extreme climates is another reason why a higher CCA-rated battery may be preferred.

2019年12月11日 · I often microwave cold coffee from earlier in the day. Mug "A" when microwaved for a minute produces hot coffee and a warm outer mug. Mug "B" produces hot coffee and a lava hot outer mug that will give you third degree burns on your hand . They look fairly similar. I am pretty sure they are both ceramic.

2012年6月30日 · No way 400mW can burn steel lol! All I can give you is experience. I had a 2W 445nm blue laser pointer focused into a 2*2mm dot. It could only burn black paper and black very thin plastic never achieving ignition. Laser's to cut metal are in the order of kilowatts, I remember seeing a CO2 laser with 50W that was used just to engrave corks for wine.