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re: If hot air rises, why are mountain tops so cold?
Posted on 5/30/19 at 3:37 pm to RogerTheShrubber
Posted on 5/30/19 at 3:37 pm to RogerTheShrubber
quote:
Air cools as it rises and loses moisture. 3.5 degrees per 1,000 feet. Air pressure is lower and which causes the molecules to separate.
It cools because the pressure/density is lower. Pressure and temperature are directly proportional. The composition of the air also plays a factor. The lighter air molecules tend to be higher than the heavier ones.
1
Posted on 5/30/19 at 3:39 pm to FightingTigers138
quote:
The reason it's actually colder is because, as you go up in the atmosphere, the Earth's atmosphere feels less pressure the higher up you go. So as the gas in the atmosphere rises it feels less pressure, which makes it expand. When the gas expands it does some work. And and if it's doing work, it must be losing some energy; and if it loses energy, its temperature must drop because we define temperature as the average energy of the particles. Therefore, if the energy of the particles is lower, the temperature must be lower.
PV=nRT
Posted on 5/30/19 at 3:39 pm to TigerBait1971
Were you perchance in a jailhouse rap video not long ago?
Posted on 5/30/19 at 3:39 pm to GumboPot
quote:
Isn't ozone unstable, that is it is very reactive and reacts with other air constituents back to O2 and needs be replenished continuously by UV light from the sun?
Pretty much this.
The UV light splits the O2 into 2 O. A free O, will react with pretty much anything. The ozone also will be split up by particular wavelengths of light, make O2 + O, then quickly reform ozone and give off heat. Then form two O2s when it runs into any free O floating about.
The UV light -> heat warms the atmosphere, and keeps the nastiest of the sun's rays from getting through.
Posted on 5/30/19 at 3:42 pm to Duke
Posted on 5/30/19 at 3:43 pm to Duke
Can the ozone layer and its cyclic daily behavior with UV be attributed to the change in the temperature gradient from the troposphere to the stratosphere?
Posted on 5/30/19 at 3:44 pm to GumboPot
quote:
The composition of the air also plays a factor.
Water vapor does, because it changes phases while rising and lets off heat while doing it.
The rest of it, doesn't make much of a difference. The O2 and N2 dwarf anything else.
Posted on 5/30/19 at 3:45 pm to TigerBait1971
The answer is that hot air will still cool quickly. In normal atmospheric conditions every 1000 feet equals a 3.5 degree decrease in ambient temperature. As the ambient air cools, so does the warm air rising.
Posted on 5/30/19 at 3:48 pm to GumboPot
quote:
Can the ozone layer and its cyclic daily behavior with UV be attributed to the change in the temperature gradient from the troposphere to the stratosphere?
The reaction cycle its self, no.
The warm over cold keeps the layer stable though, not mixing vertically. So the concentrations stay the same at a given height.
Posted on 5/30/19 at 3:51 pm to GumboPot
quote:
PV=nRT
Hey Poindexter. If I wanted a thermodynamics lesson I'd have asked for Rankine not Professor GumboPot.
Posted on 5/30/19 at 3:55 pm to MojoGuyPan
quote:
If I wanted a thermodynamics lesson I'd have asked for Rankine not Professor GumboPot.
Duke is the real professor. I'm just an engineer who likes to geek out every now and then.
This post was edited on 5/30/19 at 3:58 pm
Posted on 5/30/19 at 4:04 pm to GumboPot
quote:
Duke is the real professor.
I wouldn't say that.
Posted on 5/30/19 at 4:08 pm to TigerBait1971
Hot air rises because it is in an expanded state due to the thermal energy. The altitude of the balloon is controlled by the amount of heat/energy input. Snow on the top of the mountain is the result of thinner air and cooler temps. Air is a compressible fluid, so think about the balloon floating in a fluid of its own density where the air above is less dense and the air below is more dense.
Posted on 5/30/19 at 4:14 pm to FightingTigers138
Temperature drops with elevation...duh
Posted on 5/30/19 at 4:25 pm to ds_engineer
quote:
Air is a compressible fluid, so think about the balloon floating in a fluid of its own density where the air above is less dense and the air below is more dense.
It wouldn't rise in that case, just stay put.
The hot air balloon is probably a better way to put it. The air in that balloon is warmer and isn't as dense. So it rises.
Posted on 5/30/19 at 4:39 pm to TigerBait1971
If the sun is so hot, why is space cold?
Posted on 5/30/19 at 4:43 pm to TigerBait1971
Maybe because the higher altitude has fewer air molecules and the hot ones spread out more? I dunno
Posted on 5/30/19 at 4:45 pm to TigerBait1971
Heat comes from molecules bumping into each other. Air at sea level has a lot more molecules per square foot than air at the top of a mountain. More molecules means more collision of molecules thus warmer air.
Warm air will rise and then expand and cool. It coolw because the same amount of molecules spread out and collide less.
Aka "piv-nert"
Warm air will rise and then expand and cool. It coolw because the same amount of molecules spread out and collide less.
Aka "piv-nert"
This post was edited on 5/30/19 at 4:47 pm
Posted on 5/30/19 at 5:29 pm to FightingTigers138
That might be the dumbest thing I’ve read all week
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