Chemistry 30

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STP & SATP

 

Chemists typically make measurements under standard conditions of temperature and pressure because changes in either of these two factors will change the value of the measurement. For example we know that the volume of gases increases as temperature increases. This, in turn, will affect the density of a substance. So we often need to know under what conditions a measurement was taken. Two conditions are taken to be standards; these are known as STP and SATP. SATP is becoming the more widely used standard.

STP

Standard Temperature
and Pressure

Temperature = 0°C

Pressure = 101.325 kPa

STP

for Thermodynamics

Standard Temperature
and Pressure

 

Temperature = 25°C

Pressure = 101 kPa

SATP

Standard Ambient Temperature
and Pressure.

Temperature = 25°C

Pressure = 101.325 kPa

 

Credits | Central iSchool | Sask Learning | Saskatchewan Evergreen Curriculum | Updated: 22-May-2006