# What Does STP Mean in the Context of Chemistry

STP - short for Standard Temperature and Pressure, is a standard which is established for data comparison. Read in this ScienceStruck article about STP standard, its definition, and importance.

Prachi Patkar

StandardsEarlier, the standard pressure and temperature were defined as 101.325 kPa and 15 °C. |

Everything that we come across or use in our daily lives uses a certain standard of measurement. Price can be expressed in terms of dollars, weight can be expressed in terms of pounds and so on. Consider a parameter 'length'. What would happen if length had no unit to define its magnitude. How would we measure the lengths? Hence, standards such as centimeter, millimeter, kilometer, and so on were defined.

^{o}Celsius for temperature and 1 bar for pressure. Gases expand and contract depending on their temperature and pressure. Hence, a standard unit helps understand the degree of volume change in these gases.

Standard Temperature value: 0 ^{o}C/ 273.15 ^{o} K/32^{o}FStandard Pressure Value: 1 bar/0.987 atm/ 100 KPa |

The atmospheric pressure at the sea level is considered as the standard value of pressure, whereas the freezing point of water at the same pressure is considered to be the standard temperature.

Units of STP

Although expressed in

^{o}C and atmosphere, the other units of STP are kelvin and torr.**Problem I:**Given the standard temperature and pressure, find the volume occupied by an ideal gas.

**Solution:**Ideal gas law equation:

PV = nRT |

^{-1}mol

^{-1}, and V is the molar volume. Thus, substituting given values in the equation to find the volume.

V = nRT/P = (1 mol)(0.08206 L atm)(273)/1 = 22.4 L

Hence, proven that 1 mole of an ideal gas requires 22.414 L space.

Advantages of STP

1) Makes comparisons between sets of data simpler.

2) Simplifies calculations as the quantities to be compared will have the same units.

2) Simplifies calculations as the quantities to be compared will have the same units.