why does water vapour content decreases with the height above sea level
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In the lower part of the atmosphere - the troposphere - there is a fair amount of upward and downward motion of the air. Some of it is due to winds blowing up mountains and down the other side. Some of it is due to hot parts of the ground heating the air and making it more buoyant so it rises. Some of it is due to warmer air running into colder air and being deflected upwards. When air rises, it expands because the pressure is falling. As it expands it cools due to adiabatic expansion. When it comes back down, it get compressed and its temperature increases again. Due to these various effects, on average, the temperature gets progressively lower with altitude. This reduction in temperature with altitude is called Lapse rate.
The top of the troposphere (the tropopause) is where these ups and downs of the air peter out. Above that, we move into the Stratosphere. In this region, solar energy absorbed by ozone warms the air and the temperature goes up with altitude. It's not because you are closer to the sun though. It's more like there is less air between you and the sun, so there is more sunlight to absorb.
The top of the troposphere (the tropopause) is where these ups and downs of the air peter out. Above that, we move into the Stratosphere. In this region, solar energy absorbed by ozone warms the air and the temperature goes up with altitude. It's not because you are closer to the sun though. It's more like there is less air between you and the sun, so there is more sunlight to absorb.
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