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If the atmospheric pressure is 715 mm Hg, what is the pressure in torr?
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7. Gases
Pressure Units
Scelta multipla
Which of the following units is commonly used to express pressure measurements?
A
meter (m)
B
joule (J)
C
atmosphere (atm)
D
mole (mol)
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Understand that pressure is defined as force applied per unit area, so its units must reflect this relationship.
Recall that common units of pressure include pascals (Pa), atmospheres (atm), torr, and millimeters of mercury (mmHg), all of which relate force and area.
Recognize that 'meter (m)' is a unit of length, not pressure.
Recognize that 'joule (J)' is a unit of energy, which is force times distance, not pressure.
Recognize that 'mole (mol)' is a unit of amount of substance, unrelated to pressure, so the correct unit for pressure among the options is 'atmosphere (atm)'.
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