Whistling Tea Kettles

If you want to prepare a cup of tea for yourself, chances are you will first pour water into your tea kettle, switch on a burner, and then put the tea kettle on the stove. After a few minutes, a loud, high pitched whistle will be heard to let you know that your water is boiling and it is time to pour the water on your tea bag or into your loose leaf tea pot.

While we are all familiar with whistling tea kettles, very few people know how their tea kettle produces this sound or the original use of these kinds of whistles.

The mechanics of a whistling tea kettle are built on the principle of steam. Steam can be a very powerful source of motive power. Even today, coal, gas, and nuclear power plants create heat to turn water into steam that powers turbines. When you start to heat the water in your tea kettle, you harness that same technology.

As the water heats up some of it is turned into steam. It fills the top portion of the kettle with pressurized air that has no place to escape. Whistling tea kettles have a small opening at the spout that is guarded by two disks.

The hot steam goes through the first small hole into the place between the two disks. There it moves around rapidly until it goes through the second hole and out into the atmosphere of your kitchen. As the steam moves between the disks they vibrate rapidly. This vibration creates the whistle that you hear.

Steam whistles were originally found on all steam powered devices. For example, a proper steam whistle, such as the kind found on early British trains, used the built up pressure in the engine to create an extremely loud sound to warn passersby about the coming locomotive.

Other steam engines used their whistles as a warning sound that there was too much pressure in the boiler and it needed to be released before an explosion took place.

Today, most steel and enamel tea kettles come equipped with a whistle on the pour spot that you have to lift up before you make your tea. Others have the whistle inside the pot itself for greater ease of pouring.

Some electric tea kettles even have an electric whistle that goes off when the pot reaches a certain temperature. That innovation has taken place because most tea drinkers associate a whistling tea kettle with a perfectly brewed cup of tea.