What is the SI unit of pressure?

What is the SI unit of pressure?

• A. Pascal (Pa)
• B. Newton (N)
• C. Watt (W)
• D. Joule (J)

Answer: (A)

Pressure is the force pressed perpendicularly on a surface divided by the area over which that force acts. Since force is measured in Newtons and area in square meters, the unit becomes Newtons per square meter, defined as the Pascal (Pa). So 1 Pa = 1 N/m^2, which is also 1 kg/(m·s^2) when you substitute N = kg·m/s^2. A helpful number to keep in mind: atmospheric pressure at sea level is about 101,325 Pa, or 101 kPa. This concept is distinct from the other units listed: Newton is a unit of force, Watt is a unit of power, and Joule is a unit of energy.

Pressure is the force pressed perpendicularly on a surface divided by the area over which that force acts. Since force is measured in Newtons and area in square meters, the unit becomes Newtons per square meter, defined as the Pascal (Pa). So 1 Pa = 1 N/m^2, which is also 1 kg/(m·s^2) when you substitute N = kg·m/s^2.

A helpful number to keep in mind: atmospheric pressure at sea level is about 101,325 Pa, or 101 kPa. This concept is distinct from the other units listed: Newton is a unit of force, Watt is a unit of power, and Joule is a unit of energy.