Pressures are measured in which units?

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Multiple Choice

Pressures are measured in which units?

Explanation:
Pressure is defined as force per unit area, so its standard unit is the pascal (Pa), which is one newton per square meter. For small pressures, millimeters of water (mm H2O) are used as a practical alternative because they relate directly to the height of a water column needed to produce that pressure. The other options don’t measure pressure: Hz is frequency, dB SPL expresses sound pressure level (a logarithmic scale based on Pa), and Newtons are a unit of force, not pressure. Thus, pressure is measured in Pascals or millimeters of water.

Pressure is defined as force per unit area, so its standard unit is the pascal (Pa), which is one newton per square meter. For small pressures, millimeters of water (mm H2O) are used as a practical alternative because they relate directly to the height of a water column needed to produce that pressure. The other options don’t measure pressure: Hz is frequency, dB SPL expresses sound pressure level (a logarithmic scale based on Pa), and Newtons are a unit of force, not pressure. Thus, pressure is measured in Pascals or millimeters of water.

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