Isobaric Transformation

Similar to isothermal transformation, when there is an isobaric transformation, the pressure is conserved.

Governed by the Law of Charles and Gay-Lussac, this transformation can be expressed by:


V = volume;

T = absolute temperature;

= constant that depends on the pressure, mass and nature of the gas.

Thus, when the same gas changes temperature or volume, the relationship is valid:


A gas of 0,5m³ volume at a temperature of 20 ° C is heated to a temperature of 70 ° C. How much will it occupy if this transformation happens under constant pressure?

It is important to remember that the temperature considered must be the absolute gas temperature (Kelvin scale) so the first step to exercise resolution is the conversion of thermometric scales:

Remembering that: