What is the unit for pressure in the SI system?

What is the unit for pressure in the SI system?

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

Answer: (B)

Pressure is defined as force per unit area. In the SI system, force is measured in newtons and area in square meters, so the unit of pressure becomes one newton per square meter, called the pascal (Pa). One pascal equals 1 N/m^2. A joule is energy (force times distance), not pressure; a newton is a unit of force, and a watt is a unit of power (energy per time). In practice, pressures are often expressed in kilopascals or megapascals.

Pressure is defined as force per unit area. In the SI system, force is measured in newtons and area in square meters, so the unit of pressure becomes one newton per square meter, called the pascal (Pa). One pascal equals 1 N/m^2. A joule is energy (force times distance), not pressure; a newton is a unit of force, and a watt is a unit of power (energy per time). In practice, pressures are often expressed in kilopascals or megapascals.