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Question

Which of these is defined as “Standard Pressure”?


A

14.7 psi

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B

1 atm

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C

760 torr

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D

All the above

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Solution

The correct option is D

All the above


Standard temperature and pressure, abbreviated STP, refers to nominal conditions in the atmosphere at sea level. Standard pressure supports 760 millimeters in a mercurial barometer (760 mmHg) or 760 torr. This is about 29.9 inches of mercury, and represents approximately 14.7 pounds per inch (14.7 lb/in2).
Imagine a column of air measuring one square inch, extending straight up into space beyond the atmosphere. The air in such a column would weigh about 14.7 pounds.


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