Find several bowls, put water in order from less to more, adjust the amount of water in each bowl to make several sounds (this requires listening to the pitch carefully and adjusting the amount of water carefully), basically The principle is: the more water, the higher the sound. Then tap the edge of the bowl with chopsticks to start playing.

: The frequency of sound is called pitch, which is one of the three main subjective attributes of sound, namely volume (loudness), pitch, and timbre (also called timbre). Indicates the degree to which human hearing distinguishes the pitch of a sound.

Pitch is mainly determined by the frequency of the sound, but also related to the intensity of the sound. For a pure tone of a certain intensity, the pitch rises and falls with the frequency; for a pure tone of a certain frequency, the pitch of a low-frequency pure tone decreases as the sound intensity increases, but the pitch of a high-frequency pure tone rises as the intensity increases.

Reference: Tone-Baidu Encyclopedia