Gas Law Units - Panasonic PT-DZ12000U Operating Instructions Manual

Nomenclature
V = volume of expanded air, cu ft
vc
V = volume of free air, cu ft
P = pressure (psi)
Pa = absolute pressure (psia)
P1 = inlet (or original) absolute pressure
P2 = discharge (or final) absolute pressure
V1 = inlet (or original) volume
V2 = discharge (or final) volume
T1 = inlet (or original) absolute temperature
T2 = discharge (or final) absolute temperature
m = mass
T = absolute temperature Kelvin
R = 0.08207 lit-atm per mole-K

Gas Law Units

Positive Gauge Pressure is the pressure above atmospheric
pressure (measured in psig).
Negative Gauge Pressure (vacuum) is the difference
between atmospheric pressure and the pressure remaining in
the evacuated system (measured in "Hg or negative psig).
Absolute Pressure is the pressure above a perfect vacuum
condition measured in psia. When using gas laws, pressure
must be absolute pressure values.
Metric Units -in metric systems pressures are given in "bars"
equal to 14.50 psi. The unit of force is the newton, and the
unit of area is the square meter. One bar is 10,000 newtons
per square meter.