Why Fridge Gas Had to Change

Описание: Early home fridges used toxic gases like ammonia, sulfur dioxide and methyl chloride. In 1930 came a nontoxic, nonflammable replacement: CFCs. Decades later, scientists found CFCs were destroying the ozone layer, and in 1987 the Montreal Protocol began phasing them out. Many new household fridges today use isobutane.

Full video: How Does a Refrigerator Work?    • How Does a Refrigerator Work? (It Doesn't ...  

Sources: EBSCO Research Starters, "Midgley Introduces Dichlorodifluoromethane Refrigerant Gas"; US EPA, "The Accelerated Phaseout of Class I Ozone-Depleting Substances"; US EPA, "Transitioning to Low-GWP Alternatives in Domestic Refrigeration".
Narration is a synthetic voice.