If you are a tea lover, you've probably heard about a whistling teapot. These pots produce sounds when you pour hot water. But the whistle isn't the only sound that a whistling teapot makes. Two scientists from Cambridge discovered that a different mechanism produces a similar sound.

When choosing a whistling tea kettle, you should keep a few things in mind. Not all models come with pre-packaged filters, and these can be difficult to find at your local grocery store. Another thing to keep in mind is that a whistling tea kettle's filter isn't interchangeable with those used in other types of infusers.

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.