What unit is used to measure pressure?

Pressure is defined as the force exerted per unit area. The standard unit for measuring pressure in the International System of Units (SI) is the pascal (symbol: Pa). One pascal is equivalent to one newton of force applied over an area of one square meter. This relationship makes pascals the appropriate unit for quantifying pressure in a variety of scientific and engineering contexts, where precise measurements are essential.

Other units mentioned—such as liters, grams, and joules—are used to measure different physical quantities. Liters measure volume, grams measure mass, and joules measure energy. Each of these units serves a specific purpose and measures a distinct aspect of physical phenomena, separate from how pressure is quantified. Therefore, the pascal is the correct answer when measuring pressure.