Class 2 - Definitions
Absolute pressure is the sum of gauge pressure and atmospheric pressure. It is referenced in a perfect vacuum. The vapor pressure of a substance is always indicated in absolute pressure.
Atmospheric pressure is typically about 100 kPa at sea level, but it changes based on altitude and weather. Therefore, the atmospheric pressure on the ground will be different from the atmospheric pressure during air transport.
Gauge pressure is pressure in excess of atmospheric pressure. The pressure relating to receptacles, such as test pressure and internal pressure, is always indicated in gauge pressure.
LC50 is the concentration of a chemical in the air that kills 50% of the test subjects during an observation period.
Pressure differential is the difference in pressure between two points.
Working pressure is the settled pressure of a compressed gas at a reference temperature of 15°C (59°F) in a full-pressure receptacle.
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