Humidity Temperature Changes MET

These questions are some of the most fundamental to your understanding of the Met syllabus. If you really understand how humidity works, a lot of the rest will follow.

Here we are talking about temperature changes. It is helpful to think of the air as a fuel tank and the water vapour as fuel. Here, we are changing the temperature, so the size of the tank is changing, not the "amount of fuel".

With increasing temperature:

The factors that measure WVCWVC —Water Vapour Content will stay the same: Absolute Humidity, Humidity Mixing Ratio, Specific Mixing Ratio, Vapour Pressure. The factors that measure saturation increase (as the tank is bigger): Saturation Mixing Ratio, Saturated Vapour Pressure. The "tank" is bigger, so Relative Humidity decreases as the tank is not "as full". The fact the tank is bigger does not change the temperature you have to cool it to to become saturated, so Dew Point stays the same.