Because the tea kettle has a steam whistle in it… So when the water has reached its boiling, the top spins around from the steam makes the steam whistle, whistles…
First of all, the cover over the spout is shaped like a whistle on the inside, except that the hole for the steam to come out of is very small. They are made that way because as the water starts to boil, it starts turning into steam, and steam takes up a lot more room than water. Once it is boiling hard enough, not all of it can easily escape through the little hole, and the rest is held inside the teapot where it starts building up pressure, and as the pressure builds, the steam starts moving faster and faster through the hole. Once the pressure and speed have built up enough, it is just like you blowing into a whistle. I hope this helps.
steam and pressure
That’s the sound of pressurized steam escaping through a small opening.
the pressure of the water boiling pushes the steam through the little hole causing the sound that you hear…
steam going thrue the whistle
Steam going through the hole.
the built in steam wistle that works when the water start to boil
steam
Steam escaping fro the pot under some type of pressure built up by restricting it’s escape through a built in whistle.
It is the energy conversion, air pressure created by the fiction from the small hole and got converted to sound when it is rushing out too fast.
Because the tea kettle has a steam whistle in it… So when the water has reached its boiling, the top spins around from the steam makes the steam whistle, whistles…
First of all, the cover over the spout is shaped like a whistle on the inside, except that the hole for the steam to come out of is very small. They are made that way because as the water starts to boil, it starts turning into steam, and steam takes up a lot more room than water. Once it is boiling hard enough, not all of it can easily escape through the little hole, and the rest is held inside the teapot where it starts building up pressure, and as the pressure builds, the steam starts moving faster and faster through the hole. Once the pressure and speed have built up enough, it is just like you blowing into a whistle. I hope this helps.