begin mathsize 36px style T subscript c equals fraction numerator 8 a over denominator 27 R b end fraction end style

Tc= Critical Temperature,  a,b = Van Der Waals constant , R= Universal Gas Constant

 

Tc

a

b

 
This online chemistry calculator may be used to calculate the critical temperature. There exists a certain maximum temperature and certain maximum pressure beyond which liquid and vapor can not co-exist. This means that the phase boundary disappears beyond this temperature and pressure, and the material exists as an one phased homogeneous supercritical fluid. This maximum temperature is termed as the critical temperature.

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