1. How do relative humidity and absolute humidity differ? 2. If the temperature
ID: 439 • Letter: 1
Question
1. How do relative humidity and absolute humidity differ?
2. If the temperature of a parcel of air remains unchanged and the absolute humidity
decreases, how will relative humidity change?
3. Why does air cool as it rises through the atmosphere?
4. Explain orographic lifting.
5. What is the difference between precipitation and condensation?
6. How are clouds classified?
7. The contents of an aerosol can are under very high pressure. When you push the nozzle
on such a can, the spray feels cold. Why?
8. As you drink an ice-cold beverage on a warm day, the outside of the glass becomes wet.
Why?
9. What is the relative humidity for a parcel of air with a temperature of 70 degrees
Fahrenheit, a capacity of 24 grams and an absolute humidity of 6 grams?
10. What is dew point?
Explanation / Answer
1)Relative humidity (RH) (expressed as a percent) also measures water vapor, but RELATIVE to the temperature of the air.&Absolute humidity (expressed as grams of water vapor per cubic meter volume of air) is a measure of the actual amount of water vapor (moisture) in the air, regardless of the air's temperature.
2)relative humidity decreases in the given conditions
3)Air tends to cool in temperature when it rises in the atmosphere, but it does not lose any of the heat it had. This is due to the expansion of the gas that accompanies the decrease in atmospheric pressure. As this occurs, the heat in the gas also spreads, thereby reducing its temperature.
4)Orographic lifting occurs when an air mass forced from a low elevation to a higher elevation as it moves over rising terrain. As the air mass gains altitude it quickly cools downadi abatically which can raise therelative humidity to 100% and create clouds and, under the right conditions,precipitation
5)condensation is the formation of a liquid from water vapor on a dust or salt particle and precipitation is the water or ice reaching thebecome larger and larger so as they fall under gravity in form of rain from the cloud
6) Clouds are classified according to their height above and appearance from the ground.
7)The spray feels cold when you press the nozzle on the aerosol can because the fluid goes from high pressure to low pressure making it feel cold. Therefore, high pressure that is condensed is hot while low pressure is cool.
8)Warm air is known to carry more moisture than cold air. The water vapor present in the warm air condenses on the glass or bottle because it has a temperature less than or equal to the dew point. In case you don't know, the dew point is the temperature to which air must be cooled for saturation to occur.
10)The dew point is the temprture to which a given parcel of humid air must be cooled, at constant barometric pressure, for watervapor to condense into water. The condensed water is called dew The dew point is a saturation temperature.
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