Chemical refrigerants are assigned an R number which is determined systematically according to molecular structure.Common refrigerants are frequently referred to as Freon (a registered trademark of DuPont).hemical refrigerants are assigned an R number which is determined systematically according to molecular structure.
Some Rube Goldberg machines. use a complicated series of actions to simply move an object from. one place to another. Any object that is moving, has what is called kinetic energy; giving. an object more speed means giving it more kinetic energy.
The Rube Goldberg Machine Contest (RGMC) is named after the late cartoonist Reuben Lucius Goldberg. Having died in 1970, he lives on in the RGMC as puzzling machines with crazy mechanisms are built in the spirit of his illustrations.