Author Question: The triple point of a substance is: A) That point when the substance changes its specific gravity ... (Read 18 times)

lindiwe · **on:** Jul 24, 2018

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.

Question 2

The AHRI definition of standard air is:

A) 400 CFM per ton.
B) Air at a temperature of 0C with a relative humidity of 50.
C) Air weighing 0.075 lb/ft3 at 70F with a barometric pressure of 29.92 in Hg.
D) 78 nitrogen, 21 oxygen, and 1 other gases.