Constants and Conversion of Units
Constants and Conversion of Units
Universal (molar) Gas Constant, R
8.3143 J/mole.oK = 1.98717 cal/mole.oK
= (8.3143/101.325) liter.atm/mole.oK
= 1545.45 ft.lbf/lb.mole.oR
1 mole (or mol)
1 kg.mole (or kilomol)
Avogadro¡¯s number, NA
1 amu
6.022x1023 molecules = 1 gram-mole
1000 gram-moles (or 1000 mols)
6.022x1023 mole-1
(NA)-1
Pressure
Pa = N/m2 = J/m3 = kg/s2m
1 bar
Standard atmosphere
100,000 Pa = 0.1 MPa = 0.98692 atm
1 atm = 101,325 Pa = 29.921 inch Hg
= 760 mm Hg = 33.9 ft H2O(liq)
= 7.991 km air (0oC) = 14.696 lbf/in2
1 Torr
kilogram-force per square meter
conventional millimeter of mercury
pound-force per square inch
inch of mercury
density of mercury (at 0oC)
(1 atm/ 760) = 133.322 Pa
1 kgf/m2 = 9.80665 Pa
1 mm Hg = 13.595 mm H2O = 1 Torr
1 lbf/in2 = 1 psia = 6894.76 Pa
1 inch Hg = 3386.38 Pa
13595.5 kg/m3
TK
TC
=
=
273.15 + TC
(5/9)(TF - 32)
1 mole (or mol) ideal gas at STP
=
=
(5/9)TR ; TR = 459.67 + TF
TK - 273.15 ; TF = 1.8TC + 32
22.415 liters at 273.15oK & 1 atm
Energy, Work, Power
erg
kilowatt-hour (kWh)
thermochemical calorie
British thermal unit
foot-pound-force
horse-power
surface-tension
Planck¡¯s constant, h
Permittivity of vacuum, ¦Åo
Mass of electron, m
Charge on an electron, e
1 erg
=
1 kWh =
1 cal
=
1 Btu =
1 ft.lbf =
1 HP
=
1 dyne/cm
1 dyne.cm = 10-7 J
3.6 MJ = 3.6x106 J
4.184 J
778 ft.lbf = 1054.4 J
1.35582 J
550 ft.lbf/s
= 0.001 N/m = 1 erg/cm2
6.6256x10-34 J.sec
8.854x10-12 C2.J-1.m-1
9.11x10-31 kg
0.16022x10-18 Coulomb
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