Archive for January 21, 2020

Does Hot Water Really Freeze Faster Than Cold Water?

Does hot water freeze faster than cold water? It seems obvious that the answer should be no, because all things being equal, hot water takes longer to cool down than cold water, and so it couldn’t possible freeze faster.

But observations over thousands of years, as well as countless modern experiments, have shown that the opposite is true – under carefully controlled conditions, hot water at times seems to freeze faster than cold water.

How is this possible? Well, that’s something that still has scientists baffled – in fact, they’re still struggling to prove the effect exists in the first place, as the first episode of Derek Muller’s new science channel, Sciencium, explains.

It turns out that freezing water is a lot more complicated than you might think. Read more