Gay-Lussac's Law Calculator

Your details

Select which variable you want to calculate. Leave the other three fields filled in.
Choose the pressure unit. Both P1 and P2 use the same unit.
Choose the temperature unit. Both T1 and T2 use the same unit.
The pressure of the gas before the temperature change.
kPa
The pressure of the gas after the temperature change.
kPa
The pressure of the gas after the temperature change.
kPa
The temperature of the gas before the pressure change.
C
The temperature of the gas after it has been heated or cooled.
C
Solved value
120.0165

The calculated missing variable (pressure or temperature in your chosen units)

Initial pressure (P1)101.325
Final pressure (P2)120.0165
Initial temperature (T1)25
Final temperature (T2)80
Pressure ratio (P2/P1)1.1845
Temperature ratio (T2/T1)1.1845
Pressure/Temperature constant (k)339.845715
Initial pressure (P1)101.325
Final pressure (P2)120.0165
Initial temperature (T1)25
Final temperature (T2)80

P2 = 120.0165 kPa

  • The pressure increased by 18.4% because the temperature rose from 25.0 to 80.0 degC.
  • The P/T constant k = 339.8457 Pa/K confirms the ratio is equal in both states.
  • Gay-Lussac's Law applies only to ideal gases at constant volume. Real gases deviate at very high pressures or near their condensation point.

Next stepFor a process where both volume and temperature change, use the Combined Gas Law: P1V1/T1 = P2V2/T2. For a complete description including moles, use the Ideal Gas Law: PV = nRT.

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