PIPE CONSTANTS & CONVERTIONS

1 atm at Kpaa

101.325 Kpa

1 atm at psi

14.7 psi

1 atm at in Hg

29.92 in Hg

1 atm at mm Hg

760 mm Hg

1 atm in kg/cm²

1.033 kg/cm²

density (ρ) of water in SI

1000 kg/m³

Specific Weight $\left(\gamma\right)$ of water in SI

$\gamma$ = 9.81 KN/m³

Specific Weight $\left(\gamma\right)$ of water in English

$\gamma$ = 62.4 lb/ft³

Absolute zero temperature

-273 °C or -460°F

Universal Gas Constant (R) of any gas in SI

R= 8.314/M KJ/Kg-K

Universal Gas Constant (R) of any gas in English

R= 1545/M ft-lb/lb-R

constant pressure (Cp) spec. heat for air SI unit

Cp= 1.006 KJ/kg-K

constant pressure (Cp) spec. heat for air English Unit

Cp= 0.24 Btu/lb-R

constant volume (Cv) spec. heat for air SI Unit

Cv= 0.7186 KJ/kg-K

constant volume (Cv) spec. heat for air English Unit

0.171 Btu/lb-R

Universal Gas Constant (R) for Air in SI

0.287 KJ/Kg-K

Universal Gas Constant (R) for Air in English

53.3 ft-lb/lb-R

specific heat ratio (k) for cold air

k=1.4

specific heat ratio (k) for hot air

k=1.3

Stabdard density of air ($\rho$ ) in SI

$\rho$ = 1.20 kg/m³

Stabdard density of air ($\rho$ ) in English

0.0749 lb/m³