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