Displacement amplitude is the maximum distance a particle or object moves from its equilibrium position when subjected to a vibration or wave.
The displacement amplitude is directly proportional to the pressure and inversely proportional to the frequency of the wave. This means that as the pressure increases or the frequency decreases, the displacement amplitude also increases.
Displacement amplitude cannot be measured directly, but it can be calculated using other measurements such as pressure and frequency. Different methods, such as laser interferometry, can also be used to indirectly measure displacement amplitude.
Displacement amplitude is typically measured in meters (m) or its decimal multiples such as millimeters (mm) or micrometers (µm). In some cases, it may also be measured in other units such as nanometers (nm) or inches (in).
The displacement amplitude is directly related to the intensity of a wave. As the displacement amplitude increases, the intensity of the wave also increases, resulting in a louder or more forceful sound or vibration.