Thermo Units

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

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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.
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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) Ft×lbf (foot pound) 1 ftvlbf = 1 ft × 1 lbf = (1/144) psi × 1 ft 3 = 32.174 lbm × ft 2 / s 2 778.16 ft×lbf = 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...
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## This note was uploaded on 04/10/2009 for the course ME 2124 taught by Professor Uzgoren during the Spring '08 term at Virginia Tech.

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