Baking powder submarine
A baking powder submarine is a plastic toy submarine that dives and surfaces with the addition of baking powder. Baking powder submarines are sometimes misidentified as "baking soda submarines"; however, baking soda alone does not react when placed in water.
In 1953 Benjamin and Harry Hirsch, two brothers in a cosmetics company, discovered that carbon dioxide gas bubbles produced in wet baking powder as part of the chemical leavening process could be used to make a toy submarine dive up and down in fresh water.
They sold their idea to the Kellogg's breakfast cereal company in 1954.:34 Buoyed by the popularity of the first American atomic submarine USS Nautilus commissioned in that year, a million 4.5-inch (110 mm) plastic ship model prizes were produced by May. They were mailed out in return for a fee of 25 cents and one cereal boxtop. A smaller 2.5-inch (64 mm) version was later produced to be used as a cereal box prize not requiring separate redemption by mail.
Principle of operation
Baking powder is placed into a compartment in the bottom of the toy which is sealed except for a small hole (or holes). The toy sinks when placed into water, but after a few seconds, enough water leaks in to react with the baking powder and produce carbon dioxide bubbles. The resulting foam creates just enough buoyancy in the toy for it to rise towards the surface of the water. When the toy surfaces, it capsizes, releasing the gas into the air. The toy sinks, beginning the reaction again and repeating the entire process.:35
The same principle of operation was later used for toy frogmen powered by baking powder in a small tank on the back of the figure. However, some other cereal prizes were cartesian divers, which operated on a different principle and did not require baking powder.
In popular culture
- Edwin J. C. Sobey; Woody Sobey (2008). The Way Toys Work: The Science Behind the Magic 8 Ball, Etch a Sketch, Boomerang, and More. Chicago Review Press. ISBN 978-1-61374-309-6.
- Torgo - Baking Powder Submarines & Baking Soda Submarines
- David Veart (1 February 2015). Hello Girls & Boys!: A New Zealand Toy Story. Auckland University Press. pp. 210–. ISBN 978-1-77558-763-7.
- What ifl do? - And why? Because there's a submarine in the package | Billy Liar quotes
- "1x07 Your Place or Mine?". ShareTV.com. ShareTV, Inc. Retrieved 30 April 2016.