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The FOIL method is a special case of a more general method for multiplying algebraic expressions using the distributive law. The word FOIL was originally intended solely as a mnemonic for high-school students learning algebra. The term appears in William Betz's 1929 text Algebra for Today, where he states: [2]
Using lead foil, Adam and Jamie constructed a cube-shaped balloon with 10-foot (3 m) edges out of lead. Even without pure helium inside it (a mixture containing air was used to limit buoyancy and reduce the possibility of tearing), the balloon was buoyant enough to support a basket along with some ballast.
A toy balloon or party balloon is a small balloon mostly used for decoration, [1] advertising and as a toy. Toy balloons are usually made of rubber or aluminized plastic and inflated with air or helium. They come in a great variety of sizes and shapes but are most commonly 10 to 30 centimetres (3.9 to 11.8 in) in diameter.
Making 400 flights during his lifetime and being responsible for several balloon design innovations John Wise (February 24, 1808 – September 28, 1879) was a pioneer in the field of ballooning . He made over 400 flights during his lifetime and was responsible for several innovations in balloon design.
Balloon rockets work because the elastic balloons contract on the air within them, and so when the mouth of the balloon is opened, the gas within the balloon is expelled out, and due to Newton's third law of motion, the balloon is propelled forward. This is the same way that a rocket works.
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