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🧊 Refrigeration: the invention that rewrote what people eat

You open the fridge and January is not in there. Cold does not kill. It slows — and that delay rewrote the plate.

6
lessons
~30 min
to learn
🏛️ History
subject
Adults
level
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What you’ll learn

  1. The cupboard that is a climateTreat a refrigerator as a climate that slows microbes and enzymes at 40°F, not as a steriliser, using FDA and USDA numbers.Cold delays. Pathogens can still be silent. Forty degrees, two hours, a thermometer.
  2. Ice before the machineRead harvested ice — Tudor, Moore's named refrigerator, the ice wagon — as a supply system that failed whenever January was warm.A pond, a ship, a wagon, an oak box. Moore named it. The block still had to melt.
  3. A cycle that steals heatFollow vapor-compression from Cullen and Perkins through Gorrie, Harrison, Carré and Linde's brewery machines.Compress, condense, expand, boil. Beer paid for industrial winter. Absorption was the other family.
  4. Meat that crossed an oceanUse Dunedin's 1882 voyage — 4,311 sheep, 98 days, one condemned carcass — to show how shipboard cold joined southern flocks to northern plates.Failed ships, then Strathleven, then Dunedin. By 1914 more than 40 percent of UK meat was imported.
  5. The box in the kitchenPlace DOMELRE, Kelvinator, the 1927 Monitor Top and 1928 CFCs as the moment household cold stopped needing an ice man.3,162 hours in 1916. GE sealed the compressor. Midgley made a kitchen gas that did not kill. Leftovers became a meal.
  6. What you eat because of thisRead today's plate — out-of-season leaves, weekly milk, hemispheric meat, leftovers — as a cold chain, then go and count the fridge.Reefers, bottles, cases. The diet is a series of climates. Open the door tonight and ask whether a seasonless plate is what we wanted.

Questions this course answers

What does a household refrigerator actually do to the bacteria on food?

FDA: chilling is one of the best ways to slow dangerous bacteria. USDA: a fridge at 40°F or below protects most foods. Listeria can still grow in the cold.

Match each person to the cold they actually built

ASHRAE timeline: Cullen evaporates under vacuum; Perkins patents mechanical vapor-compression; Gorrie US 8080; Carré US 30201 absorption.

Put the vapor-compression loop in the order a fridge still runs

Perkins's closed cycle, still the household loop: compress, condense, expand, evaporate.

About how many days did Dunedin take from Otago to London with her 1882 frozen cargo?

Lloyd's Register Foundation: Dunedin arrived in London on 26 May 1882 after 98 days at sea.

What refrigerator temperature do FDA and USDA tell a household to hold?

FDA Refrigerator Thermometers and USDA FSIS: 40°F or below for the fridge, 0°F for the freezer.

Why did Frigidaire ask Midgley, Henne and McNary to invent chlorofluorocarbons in 1928?

ASHRAE 1928: CFCs synthesised at GM Research for Frigidaire, announced 1930. Early household machines used toxic or flammable gases.

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