Which unit of measurement is used for sound pressure?

The correct answer is Pascal (Pa), which is the SI unit of measurement for sound pressure. Sound pressure refers to the local pressure variation from the ambient atmospheric pressure caused by a sound wave. The pascal quantifies this variation and is defined as one newton per square meter (N/m²).

In the context of sound, sound pressure (measured in pascals) is critical for understanding how sound waves propagate through different mediums and how they can be perceived by the human ear. It provides a direct measurement of pressure fluctuations generated by sound waves, allowing professionals in audiology and acoustics to assess sound intensity and quality.

The other options, while related to the field of sound and its effects, measure different phenomena. Bar is a unit of pressure, but it is not the standard unit officially recognized for sound pressure. Decibel (dB) is a logarithmic scale used to express the ratio of a particular sound pressure level to a reference level, which makes it a useful measure in acoustics but not a direct unit of sound pressure itself. Newton (N) measures force, not pressure, making it irrelevant for measuring sound pressure directly.