Coefficient Of Thermal Expansion

Definition - What does Coefficient Of Thermal Expansion mean?

The Coefficient of Thermal Expansion is the rate change in the size of an object (could be solid, liquid or in gaseous state) with the rate change in the temperature. It generally measures the fractional change in the size of the object with the change in the temperature keeping the pressure constant. There are several types of thermal coefficients that are developed such as linear, volumetric and area thermal coefficients.

Petropedia explains Coefficient Of Thermal Expansion

Solids undergo maximum expansion when their surface temperature is increased by heating while they also contract when they are cooled. This response to the temperature change by any object is referred as coefficient of thermal expansion.

Coefficient of thermal expansion is used in:

  • Linear thermal expansion
  • Volumetric thermal expansion
  • Area thermal expansion

The thermal coefficient of expansion for crude oil and petroleum products is expressed by the following equation:


Ko , K1 and K2 depends on the type of oil used.

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