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Question:

I've a microwave for quick heating, why no gadget for quick cooling?

Just seems like they should have come up with something by now . . toss in a lukewarm drink, push a few buttons, and zap, a cold beverage!

Answer:

~ hmmm,,,,,,,good one ,,,,, mabey no one thought of it untill you just did,,,,, I would take that idea and run with it,,,,who knows ,,, you may become famouse and rich,,,,,,good idea,,,,
We know how to add energy to a liquid (or whatever), we have technology to do this because its easy to get the heat energy to flow from hot to cold. It is much more of a problem to remove energy. This takes energy, and it could be done quickly today, but it takes a lot of energy to get the heat energy to leave a substance. If you have refrigerant, a motor, two heat exchangers, and an expansion valve you could immerse one heat exchanger in the fluid you want to cool, and run the refrigerant system. Dump the heat to the atmosphere and you have a cold drink in a short time, but you would have to clean the heat exchanger after every use.
Well microwaves work by rapidly exciting the molecules in food, which in turn create heat. In order to cool something you would have to slow down the molecules or introduce a foreign substance that would cool the product. The tech is here but not for home use because the power consumption and price for either of these does not make it economical. Perhaps there just isn’t the demand for rapid cooling like there was for rapid cooking.
good thinking. heating of microwave is caused by the excitation of molecules by the magnetic wave. unfortunately you can reverse the flow of magnetic wave but you cannot produce negative value of electromagnetic and slow down the speed of molecules.
With the technology of freezing ,and with the enviromental problems of R-12 or R-134a. If you want something cold, do the old fashioned thing and put it in the fridge. It may take a little effort by opening the door, but I think you can do it

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