The refrigerator
should be kept at or below 40 degrees Fahrenheit, while the freezer should be kept at 0 degrees Fahrenheit.
Refrigeration
is a widely utilised food preservation technique around the world. Because germs reproduce at a slower pace at lower temperatures, the refrigerator lessens the rate of deterioration.
A refrigerator
is kept at a temperature that is a few degrees above the freezing point of water. The ideal temperature range for storing perishable foods is 3 to 5 °C. A freezer is a similar device that keeps the temperature below the
freezing point of water. The icebox, which had been a typical domestic appliance for nearly a century and a half, was superseded by the refrigerator.
Ancient Iranians were first to invent a type of large evaporative cooler known as
yachts, which used subterranean storage spaces and a large domed above-ground structure with thick walls and wind catchers, which was walled off further into a series of 'qanats,' or a type of aqueduct used in
Ancient Iran.
In 1755, Scottish scientist William Cullen built a modest refrigerating machine, which began the history of artificial refrigeration.
Oliver Evans, an American inventor, devised a closed vapour-compression
refrigeration cycle for producing ice from ether under vacuum in 1805.
Michael Faraday, a British scientist, liquefied ammonia and other gases using
high pressures and low temperatures in 1820, and Jacob Perkins, an
American expatriate in Great Britain, created the first operational vapour-compression
refrigeration system in 1834.
A similar attempt was undertaken in 1842 by John Gorrie, an
American physician who created a working prototype but failed commercially.
Alexander Twining, an American engineer, got a British patent
for an ether-based vapour compression machine in 1850.
James Harrison, a Scottish Australian, invented the first workable vapour compression refrigeration device. His invention for a vapour compression system using ether,
alcohol, or ammonia was issued in 1856.
