We’ve had a microwave as an economical home appliance for a long time. Why do we not have a common appliance for cooling food in seconds?
In: Engineering
Heating something up is really easy. Heat is already generated as a waste product by many appliances, so making one that does it more efficiently isn’t that difficult. And with microwaves, it’s as simple as beaming energy into the food.
However, cooling something down requires a far more complicated process. Even the fastest flash freezers still take a lot of time. You could use something like liquid nitrogen, but that’s expensive and impractical.
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