Some Unit Conversions

1 torr = 1 mm Hg
1 atm. = 760 torr
1 bar = 1x10⁵ Pa = 100 kPa = 750 torr
1 kPa = 7.50 torr
1 atm. = 1.013x10⁵ Pa =101.3 kPa = 1.013 bar

1 cal = 4.184 J
1 Cal = 1 kcal [Nutritional Calorie]

Some Physical Constants

Avogadro's Number
N_A = 6.02x10²³ mol^-1

^{The Gas Constant}
R = 8.314 J/mol-K  [SI Units]
R = 8.314 kPa-L/mol-K

Planck's Constant
h = 6.63x10^-34 J-s

Speed of Light
c = 3.00x10⁸ m/s
c = 3.00x10¹⁰ cm/s

Click here for an extended set
of Physicochemical Constants