Pressure

Pressure is used to circulate liquid in a heating or cooling system and is induced by means of pumps. The pressure in a system is positive in relation to atmospheric pressure.

Pressure is increased by means of pumps. The pressure in a system is positive in relation to atmospheric pressure. Pressure has numerous units of measurement, though those most commonly used are: Pa, kPA, bar and mVC. 

The ratios of the units are:

Bar and kPa
1 bar = 100,000 Pa = 100 kPa.
Other units include lbf/in² = psi (pounds per square inch) and mm mercury column (mmHG). These units are specified as:
1 psi = 6895 Pa
1 mmHG = 133 Pa

mVC
The unit mVC (meter water column) is dependent on gravitational acceleration, or g, which varies according to the distance from the equator.
When using mVC, the approximate value 1 mVC = 10 kPa is often used, which equates to a gravitational acceleration value of 10 m/s².





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