Pa = absolute atmospheric pressure, in psia = 14.69 psiaP0 = initial absolute pressure inside the tube, in psiaPf = final absolute pressure inside the tube, in psiaDP = absolute pressure change inside the tube during the test period, in psiaV = tube internal volume, in ft3 or in.3 as...
The API Mechanical Equipment Standards’ standard atmospheric conditions for dry air are a temperature of 60°F, which is 459.67 + 60 = 519.67°R (15.6°C which is 273.15 + 15.6 = 288.7 K), and a pressure of 14.696 psia (10.134 N/cm2 abs). The equation of state for the perfect gas...
The above form works if you are measuring differential pressure, such as the difference in psi between two points. It also gives the correct answer for absolute pressure, assuming you are measuring psia, which is the pressure relative to absolute zero vacuum. If you are measuring relative to ...
A secondary pressure standard, referred to as a transfer gauge, is an instrument which measures either gas pressure effects (e.g., the strain in an elastic element) or some physical quantity of gas (e.g., viscosity or ionization).
V / n = the gas molar volume, in m³/mol T = the gas absolute temperature, in K R = the universal gas law constant of 8.3145 m³·Pa/(mol·K) or where (in customary USA units): P = the gas absolute pressure, in psia n = number of moles, in lbmol V / n = ...
PS= Standard pressure (PSIA) PB= Atmospheric pressure – barometer (PSIA) PA= Actual pressure (PSIA) RHS= Standard relative humidity RHA= Actual relative humidity PVS= Saturated vapor pressure of water at standard temperature (PSI)1 PVA= Saturated vapor pressure of water at actual temperature (...
NTP - Normal Temperature and Pressure - is defined as air at 20oC (293.15 K, 68oF) and 1 atm ( 101.325 kN/m2, 101.325 kPa, 14.7 psia, 0 psig, 29.92 in Hg, 407 in H2O, 760 torr). Density 1.204 kg/m3(0.075 pounds per cubic foot) ...
at an elevation of 1,211 ft (369 m) on June 22, 2026, at 2:00 pm, atmospheric pressure is 14.2 PSIA (732 mmHg), humidity is 24%, and temperature is 84°F (27°C). For an air compressor to generate 45 ACFM in these conditions, it needs an SCFM rating of approximately ...
Atmospheric Pressure vs. Elevation above Sea Level Elevation above sea level - in feet and meter - with barometric and atmospheric pressure - inches mercury, psia, kg/cm2 and kPa. Barometer - Altitude Compensation Elevation compensating manometer. ...
Air flows steadily and isentropically from standard atmospheric conditions to a receiver pipe through a converging duct. The cross-sectional area of the throat of the converging duct is 0.05ft2. Determine the mass flowrate through the duct if the re...