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Air humidity measurements are based on the water content of the air, expressed as volume percentage: Relative Humidity = percentage of saturation at a given temperature Absolute Humidity = percentage of water in the air, regardless of saturation or temperature. The humidity that is talked about in weather reports, is relative humidity.
I do not believe that the normal air pressure of the Earth as a whole is terribly effected by so called "global warming". Maybe at higher altitudes where the air is actually "thinner(less oxygen content) there may be some effects but it is probably negligible.
Hygrometers measure the relative humidity of the atmosphere. The relative humidity is the ratio between the present water vapor content of the air and the maximum amount of water vapor the air could hold at the same temperature. Cool air will not hold as much water vapor as warmer air. With the same amount of moisture in the air, an increase in temperature decreases the relative humidity, and if the temperature drops, relative humidity increases.
Pressure and volatile content are the main factors as well as composition.
salinity salt or sodium
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Air humidity measurements are based on the water content of the air, expressed as volume percentage: Relative Humidity = percentage of saturation at a given temperature Absolute Humidity = percentage of water in the air, regardless of saturation or temperature. The humidity that is talked about in weather reports, is relative humidity.
Relative Humidity is actually measure the amount of moisture in the air. It depends on how much of the air has water in it. Let's say that the RH is 50%, that means 50% of the air has water in it.
When the temperature of air is cooled or reduced the relative humidity (RH) increases. The moisture content of the air remains the same until the RH rises to the point of 100% saturation and condensation occurs.
A disadvantage of using relative humidity is that it cannot indicate how much the moisture content actually is. it can only show that the air is saturated.
more than 100%(over saturated but saturation is 100%) .....because shrinkage limit is smallest water content at which soil is saturated......means at shrinkage limit itself it posses 100% saturation ........
if the oxygen saturation is 50% it means the total hemoglobin content of blood is half saturated with oxygen. in this condition the oxygen delivery to the tissues is the maximum.
It depends on the salt content of the water. (low air pressure=high salt content, high air pressure=low salt content) jks
look at this site - the info on how to find frequency, relative & relative cumulative frequency is very clear and easy to understand :) http://cnx.org/content/m16012/latest/ look at this site - the info on how to find frequency, relative & relative cumulative frequency is very clear and easy to understand :) http://cnx.org/content/m16012/latest/