Which of the following is NOT a unit of pressure?

• A. Torr
• B. Joule
• C. Atmosphere
• D. Pascal

Answer: (B)

Verified step by step guidance

1. Understand that pressure is defined as force applied per unit area, and its SI unit is the Pascal (Pa), which is equivalent to one Newton per square meter (N/m\^2).
2. Recognize that common units of pressure include the Pascal (Pa), Torr, and Atmosphere (atm), all of which measure pressure in different scales or contexts.
3. Recall that the Joule (J) is a unit of energy, not pressure. It measures work or energy, defined as one Newton meter (N\cdot m).
4. Compare each option to confirm which units represent pressure and which do not: Torr, Atmosphere, and Pascal are pressure units, while Joule is not.
5. Conclude that the unit which is NOT a unit of pressure among the given options is the Joule.