The study of moisture content in the air is Psychrometry.
Dry air is the mixture of various gases but without moisture. Dry air does not exist in nature, and the air always contains some water vapor.
The water vapor is less dense than dry air. So the air takes more water vapor, the overall density of the air reduces, and pressure reduces.
Humidity ⇧ Density ⇩ Pressure ⇩
The air takes more moisture from the surroundings with an increase in temperature. So the moisture carrying capacity of air increases with an increase in temperature.
Temperature ⇧ Air Moisture carrying capacity ⇧ Humidity ⇧
The above is true when there are a surplus amount of water bodies nearby. But when there is no water body nearby, no moisture addition is happening. So
Temperature ⇧ Air Moisture carrying capacity ⇧ Humidity ⇩
In summer, coastal areas will have high humid weather & lands away from sea or lakes will have dry, hot weather.
In winter, the air will have less moisture content as the moisture carrying capacity of air is less. So the humidity in the air will start condensing into water.
The density of air is 0.0765 lb/ft³ @ STP
The density of air is 0.075 lb/ft³ @ 14.696 psi & 70° F.
STP - Standard Temperature and Pressure - 0°C/273.15°K/32°F & 1atm/1.01325bar/ 14.696psi
Click here amount of moisture content, to know the method to calculate the moisture content in the air.
Dry-bulb temperature is the air temperature measured by a dry-bulb(a standard thermometer) that is freely exposed to the air and away from radiation and moisture.
Wet-bulb temperature is the air temperature measured by a wet-bulb( cover the tip of the thermometer bulb with wetted cloth-muslin sleeve) that is freely exposed to the air and away from radiation and moisture.
Click here Wet-bulb Temperature, for more details.
The difference in temperature between the dry bulb and the wet bulb is called Wet-bulb depression.
Low wet-bulb depression indicates higher humidity.
75° F DBT & 68° F WBT will have 70.3% RH and
75° F DBT & 72° F WBT will have 86.74% RH
It is the air temperature at which condensation of moisture begins when the air is cooled.
Click here Dew Point Temperature, for more details.
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