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Temperature
Temperature can be measured in degrees Centigrade or Fahrenheit. To change the
units press Set\Units\°C-°F.
Humidity
Humidity is measured as % relative humidity (%RH). This is the fraction of the
maximum amount of water that the air can hold at the current temperature and
pressure.
In general if the temperature is reduced the amount of water it can hold gets less. So if
the temperature of some air is reduced its humidity rises, and at some point the air will
not be able to hold the water it has and water will start to condense out (form
mist/cloud or drops of water on a surface), the relative humidity has reached 100%.
The temperature at which this happens is the dewpoint. The 764 displays the dewpoint
with the humidity and with the temperature.
The temperature/dewpoint difference is often used as a measure of the likelihood of
condensation (fog) occurring, particularly in meteorology. If the temperature is only
one or two degrees above the dewpoint in the evening then fog is likely as the
temperature falls during the night.
The UK National Trust tries to keep the indoor relative humidity between 50% and
65%, aiming for 58%.
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