The partially evacuated chamber shown in Figure 17
changes shape with changes in atmospheric pressure.
increases in length when subjected to a vacuum.
decreases in length when subjected to a vacuum.
The two reference pressures commonly used in scientific and engineering work
absolute and atmospheric.
absolute and 10 psi.
barometric and atmospheric.
barometric and absolute.
You are calibrating an absolute pressure gage at 20 psia.
referenced to atmospheric pressure, should indicate approximately
20 inches vacuum.
Specific gravity is the ratio of the density of
the substance to the density of water.
the substance to the density of alcohol.
water to the density of the substance.
the substance to the density of mercury.
When calibrating an altimeter, altitude is simulated by
vacuum and pressure.
the specific gravity of mercury.
760 millimeters of mercury.