Vapor Pressure 10
Vapor Pressure 10 : Chemistry and Chemical Disasters. The pressure exerted by a saturated vapor above its own liquid in a closed container at a specified temperature. When quality control tests are performed on products, the test temperature is usually 100 degrees F., and the vapor pressure is expressed as pounds per square inch (psig or psia), but vapor pressures reported on MSDSs are usually expressed in millimeters of mercury (mmHg) at 68 degrees F. (20 degrees C.), unless stated otherwise. Three factors are important to remember. (1) Vapor pressure of a substance at 100 degrees F. will always be higher than the vapor pressure of that substance at 68 degrees F. (20 degrees C). (2) Vapor pressures reported on MSDSs in mmHg and are almost always lower than Standard Atmospheric Pressure, 760 mmHg or 14.7 pounds per square inch. (3) The lower the boiling point of a substance, the higher will be its vapor pressure
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