Gage pressure is the difference between atmospheric pressure and absolute pressure. If you fill your tire to 35 psi as read on a tire gage, this is the gage pressure. The absolute pressure inside the tire is the pressure of the atmosphere (14.7 psi normally at sea level) plus the gage pressure.
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Gauge pressure is calculated by subtracting the atmospheric pressure from the absolute pressure. It is important to note that gauge pressure readings are relative to atmospheric pressure. So, to find gauge pressure, you would subtract the atmospheric pressure from the total pressure reading obtained.
Boyle's Law says that PV is constant for ideal gas at a constant temperature. The pressure used should be the absolute pressure, not the gage pressure. Ge the absolute pressure should be obtained using : P = PG + PE where PG = gage pressure ( kPag , psig, etc. ) PE = barometric pressure ( kPaa, psia, etc. ) P = absolute pressure ( kPaa , psia, etc. ) ( PG + PE ) ( V ) = Constant for constant temperature The g in kPag and in psig indicates gage pressure.
The absolute pressure can be calculated by adding the atmospheric pressure to the gauge pressure. If the atmospheric pressure is 101.3 kPa, then the absolute pressure of the gas would be 206 kPa + 101.3 kPa = 307.3 kPa.
The gauge pressure is the difference between the absolute pressure and atmospheric pressure. If atmospheric pressure is approximately 101.3 kPa, then the gauge pressure would be 448.980 kPa (550.280 kPa - 101.3 kPa).
Pressure= Force/Area Pressure of a Liquid is density times gravity times height
AWG stands for American Wire Gage (gage is spelt gauge in British English)The larger the gauge number, the thinner the wire.