There’s a bit more to it, but it’s because of this effect.
There is actually a balance between liquid and gas state, just overwhelmingly in favor of liquid when at normal temperatures. There is a ratio of molecules that will hit each other and transition to gas, and an equal amount gas hitting liquid and condensing. At least when there is a balance between the two sides, aka 100% moisture in the air. Which is not how it is most places.
Normally there is always evaporated water in the air, and anything that evaporated will be moved away in any mildy ventilated area, as you say, it leaves the system. So it never reaches a balance, which is why things dry up at lower temps as water will always evaporate and leave the system.
dwindling7373@feddit.it 1 month ago
I think it’s much easier and truthful to stop talking about temperature and introduce speed in that context.
The average speed is what we percieve as temperature, but single moluce can be fast, so fast as to break the boundaries of the liquid pool and shoot up toward space.
Single unbounded molecules are what gas is.
SorteKanin@feddit.dk 1 month ago
But temperature is not just the speed of a molecule right? Like a molecule moving very fast through space can still be at a very low temperature, right?
thebestaquaman@lemmy.world 1 month ago
What you’re thinking about is the relation between energy, temperature, and heat capacity. When you add energy to a system (e.g. heat) the amount of energy you need to heat it up a certain amount is described by its heat capacity. If your molecules can “wiggle” (i.e. they’re multi-atomic) a portion of the energy you’re adding will go to increasing the “wiggling” rather than the mean speed of the molecules.
What we perceive as temperature is related to the mean speed of the molecules, so because molecules that can “wiggle” more will require more heat to see the same increase in mean speed as non-wiggling molecules (because some of the heat is going to increasing the wiggling) they have higher heat capacity.
It should also be mentioned that even the concept of temperature is really a statistical concept, so it doesn’t really make much sense to talk about the temperature of a single isolated molecule, or even a pair of them. Temperature as a concept starts to be fruitful to talk about in the thermodynamic limit which classically means “a whole shitload of molecules”, but (relatively) recent research suggests “a whole shitload” can be as little as 10-30 molecules. Once you go below the thermodynamic limit, we’re not really talking about the temperature of a system, but it’s energy, which is still well defined (although definitions may vary depending on context). Depending on who you ask, it can make sense to define a temperature also for single-particle systems, but at that point we’re talking about applying thermodynamic definitions that work (and are correct in the macroscopic limit) and no longer about what we classically perceive as temperature.
SorteKanin@feddit.dk 1 month ago
Thanks, that’s useful!
dwindling7373@feddit.it 1 month ago
Wait it’s all models? Alwasy has been.
It’s kinetic energy, temperature itself is not a real thing, you are dealing with the bonds that keep water molecules together, if you wiggle hard enought, with enough energy (so… fast enough?) you break free.
I guess another way to look at it is the cloud of elecrons getting more and more messy, so that it destabilizes the bonds…
Asetru@feddit.org 1 month ago
It pretty much is.
That very much depends on the relative speed of the molecule and you. If you’re not moving in relation to the molecule, a collision between you and it won’t do much. Now try being hit by it (or a bunch of them) at high or even relativistic speeds. The area of you that’s hit will surely become pretty hot then.
Like, have you seen footage of asteroid impacts? Have you seen shooting stars? Those are hot. Like, non-figuratively.
Snowclone@lemmy.world 1 month ago
Next explain what mass is in 10,000 words or less. I know two whole ass physics classes aren’t enough, so. I’m trying to be generous.
dwindling7373@feddit.it 1 month ago
The reason you need to apply force to an object to change its speed.