The Triple point of a substance is:
A) The point where a substance can exist as a solid, liquid, or vapor at the same time at one specific pressure and temperature.
B) The point at which the substance changes state at the same pressure, temperature, and volume.
C) That point when the substance changes its specific gravity at the same pressure, temperature, and volume.
D) The point when the density of a substance changes to a solid, liquid, or vapor at standard conditions.
A
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