5.6 Experimental Determination of Critical Constants
The three critical constants—critical pressure, critical volume and critical temperature—are very much important in the study of gases, especially in liquefaction.
Of the three constants, measurement of critical temperature and critical pressure is very easy. The measurement of critical volume is very difficult because it varies considerably for slightest variation of temperature and pressure near the critical region; hence for the measurement of critical volume, the substance must be kept in perfectly critical temperature and pressure.
The experimental arrangement of the determination of critical pressure and critical temperature is shown in Fig. 5.7. A is a hard glass tube containing the ...
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