What is the SI unit of Pressure?

Pascal

The correct answer is option 3. Pascal (Pa).

Pascal (Pa) is the SI unit of pressure, named after the French mathematician and physicist Blaise Pascal. One Pascal is defined as one Newton per square meter (1 Pa = 1 N/m²). This unit is widely used in scientific and engineering contexts to measure pressure.

In simpler terms, pressure is the force applied per unit area. The formula for pressure (P) is given by:

\[ P = \frac{F}{A} \]

where:
- \( P \) is the pressure,
- \( F \) is the force applied, and
- \( A \) is the area over which the force is applied.

The Pascal provides a standardized and globally accepted unit for measuring pressure in various fields, including physics, engineering, and meteorology. It is a small unit, so kilopascals (kPa) or megapascals (MPa) are often used for practical applications where larger values are encountered.

Other units, such as bar, atmosphere (atm), and millimeters of mercury (mm Hg), are also used for pressure measurements, but the Pascal is the SI unit recommended for scientific and international use.