Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are fully or partly halogenated paraffin hydrocarbons that contain only carbon (C), hydrogen (H), chlorine (Cl), and fluorine (F), produced as volatile derivatives of methane, ethane, and propane. They are also commonly known by the DuPont brand name Freon.
invented by Michael Faraday
Electromagnetic or magnetic induction is the production of an electromotive…
invented by
A tunnelling shield is a protective structure used during the excavation of…
invented by Alessandro Volta
The voltaic pile was the first electrical battery that could continuously…
invented by Francis Ronalds
An electrical telegraph was a point-to-point text messaging system, used from…
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