Red Seal Instrumentation and Control Technician Practice Exam

Which measurement unit is commonly used to express pressure?

1. Pascals

2. Watts

3. Ohms

4. Volts

The correct answer is: Pascals

The measurement unit commonly used to express pressure is Pascals. The Pascal (Pa) is the SI (International System of Units) unit of pressure, defined as one newton per square meter. It reflects the amount of force applied per unit area, which is fundamental in various fields like engineering, meteorology, and fluid dynamics. Pascals are widely used in various applications, including measuring atmospheric pressure and in industrial processes where pressure plays a crucial role. Other units related to pressure, such as bar or psi (pounds per square inch), can be converted to Pascals, illustrating its importance and commonality in pressure measurement. The other units listed—Watts, Ohms, and Volts—are related to electrical measurements and do not define pressure. Watts measure power, Ohms measure resistance, and Volts measure electric potential, which are essential in electrical engineering but not relevant to pressure.