Final answer:
The unit 'mL' is not a unit of pressure, it's a unit of volume. Units 'atm' (atmospheres), 'mmHg' (millimeters of mercury), and 'torr' are all legitimate units of pressure, with 1 atm being equivalent to 760 mmHg or 760 torr.
Step-by-step explanation:
All of the following are units for pressure, EXCEPT:
- A. atm
- B. mmHg
- C. mL
- D. torr
The correct answer is C. mL, which is not a unit of pressure; it is a unit of volume. The rest, atm (atmospheres), mmHg (millimeters of mercury), and torr are all units of pressure. The atmosphere unit is redefined to be exactly equivalent to 760 mmHg or 760 torr, establishing a direct equivalence among these units of pressure.
Pressure units can be converted between each other using established equivalencies. For example, 1 atm is equal to 101,325 Pa (pascals) in the formal SI unit system. Knowing these conversions is pertinent in various fields such as meteorology, vacuum physics, and chemistry where pressure measurements are essential.