Question

Which of these is defined as “Standard Pressure”?

• A. 14.7 psi
• B. 1 atm
• C. 760 torr
• D. All the above

Answer 1

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.