Describe the relationships between:?

Question

Air temp. and air pressure.

Air temp. and relative humidity

Air temp. and dew point

Relative humidity and air pressure

Answer 1

If the air temperature increases over a place,the air becomes warm and light.As the pressure is the weight of the overlying column of air at a place,the weight of the heated air column becomes less and hence the pressure also becomes less.So,in the atmosphere,if air temperature increases,the pressure becomes less.

If air temperature increases,the air becomes more unsaturated and the relative humidity becomes less(provided no moisture is added).On the other hand if temperature decreases,the RH increases.

If air temperature increases,the dew point remains the same if no moisture is added.If the temperature decreases,the temperature becomes equal to dew point temperature,in which case,condensation begins.

If the pressure is less over a place(low-pressure area),winds from all sides converge there creating a convection current.So, the air rises and cools,in which case, the RH may increase.Over a high pressure area,air sinks and becomes warmer in which case RH may come down.