STP

STP is used in many thermodynamic calculations and tabulations. Certain properties of matter such as density, viscosity, boiling point etc. will vary with changes in temperature or pressure. Having one common set of conditions ("state") for tabulating these values makes comparisons possible and eases calculations.
STP is defined by IUPAC (International Union of Pure and Applied Chemistry) as air at 0°C (273.15 K, 32 °oF) and 105 pascals (1 bar).
Category:Chemistry