Recent content by aochider

that is exactly what i needed to know. thanks!

ah, thanks for the explanation. i had been using heat and thermal energy interchangeably. i also didnt realize something could have any thermal energy at absolute zero. usually evaporation is taught as having a pressure and temperature component. that is why I am asking if something can...

i think there might be a misunderstanding. my question is regarding if it is possible to change a liquid into a gas even if there were 0 heat in the substance trying to be evaporated. it seems like it is not though, based on the responses in this thread.

if the temperature is absolute zero, then that means if a liquid changes into a gas then it could do so without any heat. but it seems as though that is not possible and there always needs to be some heat in order for a phase change to occur.

seems like the consensus is that heat is the key component of a phase change. a lack of pressure only hastens that process, but cannot cause it on its own. but because we can't make anything absolute zero, there no way to really test. i just wanted to understand what components contributed to...

i guess what I am getting at is whether or not heat is necessary for a phase change. and it sounds like youre saying yes, heat is necessary for phase change. lack of pressure alone cannot drive a substance to change phase.

so that means if something were at absolute 0 and in a vacuum, it couldn't change phases??

thank you for the explanations. so, am i right in saying that heat is not necessary for a phase change? for instance, if a substance was in a 0 pressure container and also at absolute zero, it would exist as a gas? im asking because I've been operating under the assumption that a phase...

Is it possible to make a liquid evaporate solely with vacuum? If you were to reduce the pressure in a container of liquid to 0, while also insulating it from any outside heat, would it remain a liquid or turn into a gas? If it turns into a gas via lack of pressure alone, does the...

thank you for the help! might be more of an engineering question now, but couldn't you use pressurized gas as a form of refrigeration technology? or is the cooling effect not great enough and that is why we need to involve the phase change part (like in current refrigeration technology)?

thanks! for 3, does this apply to a pressurized container that was opened in the free atmosphere? so you pressurize a bottle with a pump, detach the pump, let the container cool, and then open the lid. air rushes out and at least momentarily is cooler than the surrounding air. there is no...

excellent visualization for that one. thanks!

I've been a bit confused about when/why an expanding gas cools. Here is what I've heard so far: Refrigeration systems work based on using heat that is used merely to break attraction of molecules of liquids at their boiling point (eg, freon released through an expansion valve gets cooler...