There are no moving parts and the water should only make a sound when the water is converted to gas (boiling). Where does the sound come from when the water looks completely still?
In: Physics
The cooker has a pump, which includes an electric motor, a shaft spinning against a seal, and the actual pump impeller.
Water is also an excellent noise conductor so it broadcasts everything.
I assume your talking about an electric kettle? The sound you hear during the middle of the heating cycle is actually tiny bits of water near the heating element beginning to boil as tiny bubbles and then quickly collapsing once they move into the upper layers of water which are still nowhere near the boiling point yet.
It sounds more vigorous during the middle because as the water gets closer and closer to boiling, the bubbles are bigger and less numerous and they don’t recondense as quickly.
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