If both have same temperature, pressure, and volume.
2007-05-17 08:43:13 · 13 answers · asked by Alexander 6 in Science & Mathematics ➔ Physics
Dry air weighs more than humid air, because water molecules substitute gases which are heavier.
2007-05-17 08:48:43 · answer #1 · answered by Anonymous · 1⤊ 1⤋
When the air pressure is low to near precipitation of rain due to the high water content in the air,we have water molecule displacing air molecule.
The water molecules weight less than the air molecule which consist of 2 oxigen atoms ,whereas water molecules consist of 2 hydrogen atom and one oxigen atoms.
Hence air molecules nearly weights twice as much as water molecules.The two systems cannot have the same temperature ,pressure and volume. The dry air would have higher pressure.
2007-05-17 08:55:49 · answer #2 · answered by goring 6 · 0⤊ 0⤋
You've already got the answer you were looking for and, as a private pilot, I can confirm that we adjust our take-off distance for what is called density altitude. Warmer air and moist air is like taking off at a higher altitude and it requires a longer runway. But there is more to it. As water molecules mix with the air, right above the sea, and the sunshine warms up the surface of the sea, that thin layer of air gets lighter and start rising. As it does, the pressure falls with altitude and the air cools down by the so-called adiabatic effect. It does so all the way to the point where the air is 100 percent saturated; it can't sustain more moisture. Water molecules must then condense on anything, dust particles, etc. But, as it does, it releases heat in the process. That makes the parcel of air even lighter and it keeps rising. That is how clouds are formed. As the air reaches the so-called dew point temperature, it forms the base of the cumulus clouds. And when a parcel, finally, reaches a place of equal surrounding temperature, it forms one of the top of the cauliflower-shaped cloud.
2016-05-21 22:33:46 · answer #3 · answered by ? 3 · 0⤊ 0⤋
As normal, dry air has a mol.mass of 29, and water vapour in the air decreases the % of dry air and has a mol.mass of 18, the dry air will be heavier.
2007-05-17 08:56:27 · answer #4 · answered by Norrie 7 · 3⤊ 1⤋
It would be humid air since it has more water vapor mixed with the air particles, dry air would logically be lighter since it has much less water vapor.
2007-05-17 08:47:58 · answer #5 · answered by bravokardia 4 · 0⤊ 1⤋
humid, the water ads weight to the air but the air itself stays the same.
2007-05-17 08:46:23 · answer #6 · answered by nukka3 1 · 0⤊ 3⤋
humid as it contains more water vapor, but I'm not sure how that would be possible as if both contain the same volume, pressure and temperature, they would both weigh the same unless they were two seperate gasses.
2007-05-17 08:46:53 · answer #7 · answered by paratechfan 3 · 0⤊ 2⤋
It would be "humid air." Be careful of the wording, though. Humid air isn't just air (a mixture of nitrogen and oxygen). It's a mixture of nitrogen, oxygen, and water.
2007-05-17 08:47:23 · answer #8 · answered by not gh3y 3 · 0⤊ 2⤋
Humid air I would say B/C it contains water. The moister adds weight.
2007-05-17 08:45:40 · answer #9 · answered by Sugar 7 · 0⤊ 5⤋
humid air
2007-05-17 08:46:17 · answer #10 · answered by Darce 3 · 0⤊ 4⤋