The whistle sound produced by a whistling teapot is based on the same mechanism as that of an organ pipe or flute. The length of the spout determines the pitch of the sound; a shorter spout produces a higher pitch and a longer spout makes a lower pitched whistle.
A whistling kettle is the perfect way to get your tea or coffee brewing on the go. They use less energy than other types of kettles, so they can be a great addition to any kitchen. The main benefit of a whistling kettle is that you can use it on either gas or induction.