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Pressure is usually expressed in what units?
Pounds per square inch
Newton meters
Kilopascals
Bars
The correct answer is: Pounds per square inch
Pressure is the amount of force applied over a certain area. The most common units used to express pressure are Pounds per square inch (psi), Newton meters (N/m^2), Kilopascals (kPa), and Bars (Bar). Option A is the most common unit used in the United States, while Options B, C, and D are used internationally. Option B, Newton meters, is a unit of work and not pressure. Option C, Kilopascals, is a unit of pressure commonly used in Canada and Europe. Option D, Bars, is a unit of pressure commonly used in Europe and Asia. Therefore, Option A is the most accurate and commonly used unit to express pressure.