Autool LM120 Plus Podręcznik użytkownika - Strona 13
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Sensible heat and latent heat
The amount of heat required to raise the water temperature from 0 degrees
to 100 degrees is sensible heat, the water is heated to 100 degrees, and the
hot water becomes water vapor, but the temperature is still 100 degrees.
The heat required for this process is called latent heat.
Gauge pressure and absolute pressure
Gauge pressure: Gauge pressure refers to the pipeline pressure, refers to
the pressure measured by pressure gauges, vacuum gauges, U-shaped
tubes, etc., also known as relative pressure. The "table pressure" starts with
atmospheric pressure and the symbol is Pg.
Absolute pressure: The pressure directly acting on the surface of a container
or object is called "absolute pressure", the absolute pressure value is
absolute vacuum as a starting point, the symbol is PABS (ABS is a
subscript) and the absolute pressure is atmospheric pressure + gauge
pressure.
At atmospheric pressure, the gauge pressure is 0 and the absolute pressure
is 1.013 bar.
Dry bulb temperature, wet bulb temperature and black ball temperature
Dry bulb temperature: the temperature measured by ordinary thermometers.
Wet bulb temperature: a wet cloth is wrapped around the thermometer, and
the temperature indicates a drop due to the evaporation of water. The
temperature at this time is called the wet-bulb temperature.
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