Explain how temperature affects relative humidity.?

Question

help!!! 4 today plz

Answer 1

Relative humidity is a measure of how much water vapor is in the air relative to how much water vapor the air is capable of holding. If the relative humidity is 50% the air is only holding half as much water vapor as it's capable of holding. How much water vapor air capable of holding is determined by it's temperature. When air is warm it expands allowing more room between the air molecules to hold water vapor. Thus warm air can hold large volumes of water vapor. When air cools it contracts allowing for less room between air molecules. Cool air cannot hold as much water vapor as warm air. If you want to raise the relative humidity of air just cool it down. When warmer moist air is cooled to it's dew point, this is the point of 100% saturation or 100% relative humidity. At this temperature the air molecules begin to squeeze the water vapor out of the air and condensation occurs forming dew, fog, or clouds.

Answer 2

Temperature does not change Barometric Pressure. In theory it could since cold air is denser than warm air but in Earths atmosphere it does not. It is not like a popcorn bag because the earths atmosphere is not trapped in a paper bag. It can expand when it gets warmer and shrink when it gets colder. Usually areas of cold and area of warm balance this pressure gradient out Temperature do affect relative humidity ALOT. This Morning when I woke up the temperature was 24 degrees. The humidity was 91%. When I came home in the afternoon the Temperature was 53 degrees. The humidity was 40%. This happens every day. When the temperature drops it gets closer to the dew point. The dew point if fog or 100% hhumidity. Cold air cannot hold as much moisture since it gets denser. Therefor there is the same amount of moisture just denser air resulting in higher humidity. Same with warm air but the humidity goes down because the air expands.

Answer 3

Saying that air can "hold no more water" is a very bad way of describing saturation (100% relative humidity). The misconception arises in that water begins to condense out when you reach 100% humidity. What that doesn't mean is you could not add any more water to the air. In fact, if you add more water all you are doing is changing the amount of evaporation/condensation that is occurring. The water is still going into the air.

Anyway, relative humidity is a measure of how close you are to having more condensation than evaporation occurring. So say you have 2 "parcels" of air fill with equal amounts of moisture (a parcel is just some imaginary piece of air-picture a a block of air the size of your house). At the same temperature, they'd have the same relative humidity. If you increased the temperature of one of the parcels, its relative humidity would drop compared to the lower temperature parcel.

It's difficult to explain more thoroughly without using some more advanced physics, so I'd recommend using another site if you are interested. I'll list the wikipedia link below-it's correct and explains everything you could want to know.

Answer 4

This Site Might Help You.

RE:
Explain how temperature affects relative humidity.?
help!!! 4 today plz

Answer 5

Good question. Ok here is how temperature affects RH. The higher the temperature the greater is the amount of water vapor the air can "hold". The higher the dewpoint temperature the greater the amount of water vapor the air does "hold". So temperature is a measure of the potential and dewpoint is a measure of actual water content of the atmosphere.

Answer 6

No, no, no! The idea that air "holds" water vapour is wrong. It doesn't "hold" water vapour any more than it "holds" oxygen or nitrogen or any of the other gases in air.

For a very good explanation of this you should read the Bad Meteorology page

http://www.ems.psu.edu/~fraser/Bad/BadClouds.html