Autool LM120 Plus Manual do utilizador - Página 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.