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 Friedrich Koenig
A printing press is a mechanical device for applying pressure to an inked…
invented by Lester Allan
The Pelton wheel or Pelton Turbine is an impulse-type water turbine invented by…
invented by
A tunnelling shield is a protective structure used during the excavation of…
invented by Alexander Parkes
Celluloids are a class of materials produced by mixing nitrocellulose and…
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