WIND CHILL The chilling effect of the wind can
be represented by the lower temperature that would be required
to produce the same chilling sensation for a person walking
in calm conditions. This is known as the wind chill equivalent
temperature and is an important indicator in assessing the
comfort of personnel spending periods outdoors. It is not
an indication that an unheated inanimate object will cool
below the ambient air temperature.
Wet bulb temperature
The temperature of the wet thermometer bulb in a wet and dry
bulb hygrometer. The wet bulb is surrounded by wet fibres
and evaporation of water from the fibres cools the wet bulb.
The rate of evaporation depends on the relative humidity of
the air.
Density Altitude
The altitude in the standard atmosphere corresponding to a
specific air density.
Dew Point
The temperature at which dew or condensation begins to form.
Relative Humidity
The ratio, expressed as a percentage, of the actual vapour
pressure to the saturation vapour pressure.
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