What’s behind? STEM tips
Sound is a vibration through a medium such as air, but it can propagate also through liquid or solid.
The sound wave as a shape, the frequency of the wave determines the note (A, B, C..).
While is the amplitude of the wave to determine if the volume of the sound is higher (louder) or lower (soft). The volume is measured in decibels dB, while the frequency is measured in Hertz Hz.
More about sound waves: