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What is something many people believe but is not true? (lemmy.ml)

submitted 1 year ago by GatoB@lemmy.ml to c/asklemmy@lemmy.ml

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[–] SkepticElliptic@beehaw.org 2 points 1 year ago (1 children)

That cold water will boil faster than warm water.

It's a confusion. You should always cook with cold tap water, not hot, because hot tap water can contain excessive amounts of lead.

There are several instances where hot water can freeze faster than lukewarm water. I believe people saw this on shows such as Bill Nye and then forgot the specifics.

[–] gnuhaut@lemmy.ml 0 points 1 year ago (2 children)

I will believe that warm water freezes faster only if I see it with my own eyes. It just goes against everything I know about thermodynamics.

[–] SkepticElliptic@beehaw.org 0 points 1 year ago (1 children)

It requires very specific circumstances. Given the same ambient temperature hot water will cool at a faster rate than cooler water because of the greater temperature differential.

Hot water will lose more mass as more will evaporate as it cools.

https://en.m.wikipedia.org/wiki/Mpemba_effect

It's one of those "wacky" physics facts.

[–] gnuhaut@lemmy.ml 1 points 1 year ago

In 2016, Burridge and Linden defined the criterion as the time to reach 0 °C (32 °F; 273 K), carried out experiments, and reviewed published work to date. They noted that the large difference originally claimed had not been replicated, and that studies showing a small effect could be influenced by variations in the positioning of thermometers: "We conclude, somewhat sadly, that there is no evidence to support meaningful observations of the Mpemba effect."

I'm with those guys.

[–] conrad82@lemmy.ml 0 points 1 year ago (1 children)

I heard hot water freeze faster when thrown in freezing cold air, because it evaporates faster - making smaller droplets and increasing the surface area

[–] gnuhaut@lemmy.ml 0 points 1 year ago (1 children)

Right, I can believe that. I was thinking of making ice cubes, which is also something I heard.

[–] cnschn@lemmy.cnschn.com 1 points 1 year ago

This is actually a thing, it's called the Mpemba effect. It's hella weird (that's the scientific term), but can be reproduced in experiments.