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Varies between substances. Ex The vaporization pressure and temperature of water is different from Mercury.

ans2. The concept you should study is the Triple Point of the material. The temperature and pressure at which the material can co-exist as liquid, solid, and gas phases.

For water, this temperature is 273.16oK at 0.6117 kPa. (and has been so for 50 years, but 0oC is adequate for ordinary mortals.)

For CO2 the TP is at 216.55oK at 517kPa.

For mercury, TP is at 23.2oK, at 1.65x10-7 kPa.

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