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there are chemical things that can do that and also cup coolers with peltier elements
I've been wondering this for my entire life
i would think not. unless waves can be tuned to cancel out background radiation, but that would only stop it from heating up more.
Besides freezers I donβt think thereβs any technology we know that could do this on a wide range of substances. But freezers are neat - they move heat from the inside to the outside and as they are insulated they can reach temperatures 40-50 degrees (Celsius) under their surroundings
Given how much about science we still have to learn, I would say it is a distinct possibility. If you want something cheap and easy to use like a microwave to do this though, I highly doubt we'd see that possible for the next 30-40 years at minimum.
A freezer?
https://m.youtube.com/watch?v=Cb_s_8aEVuQ
They trial'd something similar on the snowpeircer train instead of treats like ice cream for good behaviour they froze your arm off for being naughty lol
It's a good job they didn't have that when I was at school because I'd be just a head and torso now lol
Not really proven. It's theorized to be possible, but nothing emits cold that we know of in the same way. Microwaves, use waves (citation needed) to heat up the food, cold to our know doesn't work the same way.