Before refrigerators pioneers would smoke or "cure" their meat by preserving it with salt. However they didn't usually have a lot of food that needed to be preserved or cooled. They lived off the land and only hunted what they could eat in the next meal or two. Hunting and fishing was a daily job.
Refrigerators use magnets on the door the keep the cold air in, Same with the freezer door.
No. Most refrigerators use a coolant system similar to air conditioners (which use freon).
Refrigerators use magnets on the door the keep the cold air in, Same with the freezer door.
Commercial-size refrigerators are generally much larger than home refrigerators. Thus, commercial-size refrigerators consume more electricity and use more power.
No they were beyond that. Romans used spears. Pioneers had guns.
no?
they use pioneers
Many car refrigerators work by getting their energy from the car's battery. Other refrigerators are solar powered or could use other energy sources but most use the energy from the car to stay cold.
r12 or 134a
yes
If they are chilled. Use refrigerators.
To keep their food from going bad.