Abbreviations
————-
atm – atmosphere
mm Hg – millimeters of mercury
torr – another name for mm Hg
Pa – Pascal (kPa = kilo Pascal)
K – Kelvin
°C – degrees Celsius

Conversions
———–
K = °C + 273
  (cubic centimeter to milliliter)
  (cubic decimeter to liter)
1 mol ideal gas occupies 22.4L at STP 0C and 1atm pressure

Standard Conditions
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0.00 °C = 273 K
1.00 atm = 760.0 mm Hg = 101.325 kPa = 101,325 Pa   atmosphere to mm mercury to kilo Pascals