The unit for measuring wavelength is typically expressed in meters (m). In many cases, especially in physics and engineering, wavelengths are also measured in nanometers (nm), micrometers (µm), or centimeters (cm), depending on the scale of the phenomenon being studied.
Wavelength refers to the distance between successive peaks of a wave, such as light or sound waves. For instance, visible light has wavelengths that range from about 400 nm (violet) to 700 nm (red), while radio waves can have wavelengths from a few centimeters to several kilometers. Using the appropriate unit helps provide clarity in understanding the particular type of wave being discussed.