id gas by filling a strongglass tube with it, and allowing the open end of the tube tocommunicate with a reservoir of mercury. By means of ascrew plunger the mercury was forced up the tube, thus com-pressing the gas. Carbonic acid gas, at a temperature of about13° C., can be liquefied at a pressure… … Fig. 61. 118-119] CHANGE OF STATE. LIQUID TO VAPOUR. 135 ture exceeded this value no pressure however great reduced itto the liquid state. This temperature is called the criticaltemperature for carbonic acid. Below its critical temperaturecarbonic acid gas has the properties of a vapour; it can…
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