is humidity important for meteorologists?
vapour is always mixed with air throughout the atmosphere.
When this water becomes condensed, it forms many types of
weather phenomena; clouds, rain, hail, snow, fog, dew...
and the list goes on!
see. But how is humidity measured?
quite difficult to measure humidity without sophisticated
apparatus. The traditional way meant that a comparison
had to be drawn between 'wet' and 'dry' thermometers.
Most of the stations now, including us at BSMO, have a
box which calculates the humidity, making it much easier!
Humidity is measured in grams per cubic metre.
I'm confused! I thought that humidity was expressed as a
fraction or percentage on TV broadcasts.
be. The percentage is the fraction of the total possible
amount of water that potentially could be in the volume.
For instance if the maximum level was 10 grammes per
cubic metre, and it was measured to be 5 grammes per
cubic metres, then there would be a relative humidity of
the maximum level of humidity vary depending on
does. This maximum level is called the saturation level.
For instance, at zero degrees Celsius, the saturation
level is at 5 grammes per cubic metre, but at room
temperature, saturation is at about 9 grammes per cubic
metre. This means that any air will be become saturated
if it is cooled enough. Beyond this, excess water is
condensed. This is the reason why the warm air breathed
by people in a cold car leaves misty windows!