Thermo Units

Thermo Units - psig (psi gage) 0 psig = P atm absolute...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Typical Thermodynamics Units under the SI and British Systems Dimension SI Unit British Unit Symbol Mass Moles kg (kilogram) kgmol or kmol (kilomol) units of molec. wt. are kg/kgmol lbm (pound mass) lbmol (pound mole) units of molec. wt. are lbm/lbmol m n Length m (meter) ft (foot) x Time s (second) s (second) t Force N (Newton) 1 N = 1 kg × m / s 2 lbf (pound force) 1 lbf = 32.174 lbm × ft / s 2 Absolute Temperature K (Kelvin) 1 K = 1/100 difference between freezing and boiling points of water. R (Rankine) 1 R = 1/180 difference between freezing and boiling points of water. T Relative Temperature o C (Degree Celsius) 0 o C = 273.15 K o F (Degree Fahrenheit) 0 o F = 459.67 R T Absolute Pressure Pa (Pascal) 1 Pa = 1 N/m 2 1000 Pa = 1 kPa (kilo Pa) 1000 kPa = 1 MPa (mega Pa) psia (pound per sq. in., absolute) 1 psia = 1 lbf/in 2 1 psia = 144 lbf/ft 2 P Gage Pressure Pa Gage 0 Pa Gage = P atm absolute = 101.325 kPa @ std. conds.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: psig (psi gage) 0 psig = P atm absolute =14.696 psia @ std. conds. P Volume m 3 (cubic meter) ft 3 (cubic foot) V Specific Volume m 3 /kg (mass basis) m 3 /kmol (mole basis) ft 3 /lbm (mass basis) ft 3 /lbmol (mole basis) v _ v Energy Enthalpy J (Joule) 1 J = 1 N 1m = 1 Pa 1 m 3 = 1 kg m 2 / s 2 1000 J = 1 kJ (kilo J) Ftlbf (foot pound) 1 ftvlbf = 1 ft 1 lbf = (1/144) psi 1 ft 3 = 32.174 lbm ft 2 / s 2 778.16 ftlbf = 1 Btu (Brit. thermal unit) U H Specific Energy Enthalpy kJ/kg (mass basis) kJ/kmol (mole basis) Btu/lbm (mass basis) Btu/lbmol (mole basis) u, h _ __ u , h Entropy J/K (Joules per Kelvin) 1000 J/K = 1 kJ/K Btu/R (Btu per Rankine) S Specific Entropy kJ/kg/K (mass basis) kJ/kmol/K (mole basis) Btu/lbm/R (mass basis) Btu/lbmol/R (mole basis) s _ s Power W (Watt) 1W = 1 J/s = 1 N m / s 1000 W = 1 kW (kilo W) hp (horsepower) 1 hp = 550 ft lbf / s . W...
View Full Document

Ask a homework question - tutors are online