Probably a stupid question, but will we ever have something like a microwave to make things cold? Is there a reason this can't exist?

Melatonin@lemmy.dbzer0.com to Asklemmy@lemmy.ml – 486 points –
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This is a bit like asking if we could build a flashlight that emits a beam of darkness I think

It's not. A device that rapidly cools things down placed inside it isn't implausible. He's not asking for a beam of absence, he's asking for an enclosed space that subtracts heat.

Shooting something with “cold energy beams” is an anti-microwave

We aren’t talking about machines to make things cold, I was asked if we could make microwaves that make stuff cold

Very much so, and equally possible in theory (interference patterns with light exist, light cancellation could work somewhat like noise cancelling) but also equally impossible to do at anything much above an atomic scale.