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

submitted 2 years ago by GatoB@lemmy.ml to c/asklemmy@lemmy.ml

201 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[-] gnuhaut@lemmy.ml 3 points 2 years ago

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.

[-] conrad82@lemmy.ml 6 points 2 years ago

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 2 points 2 years ago

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

[-] cnschn@lemmy.cnschn.com 3 points 2 years 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.

[-] conrad82@lemmy.ml 1 points 2 years ago

We did an experiment in university where we cooled distilled water, which was completely still. We managed to get the temperature down to -7C I think before it froze. It quickly rose to 0C when it started freezing. kinda cool.

I've seen youtubers repeat the experiment, think it's called supercooling. It also causes longer time to freezing, and was one of many theories for the Mpemba effect

[-] SkepticElliptic@beehaw.org 2 points 2 years ago

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 4 points 2 years 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.

this post was submitted on 07 Jun 2023

87 points (100.0% liked)

Asklemmy

44149 readers

1213 users here now

A loosely moderated place to ask open-ended questions

Search asklemmy 🔍

If your post meets the following criteria, it's welcome here!

Open-ended question
Not offensive: at this point, we do not have the bandwidth to moderate overtly political discussions. Assume best intent and be excellent to each other.
Not regarding using or support for Lemmy: context, see the list of support communities and tools for finding communities below
Not ad nauseam inducing: please make sure it is a question that would be new to most members
An actual topic of discussion

Looking for support?

Looking for a community?

Lemmyverse: community search
sub.rehab: maps old subreddits to fediverse options, marks official as such
!lemmy411@lemmy.ca: a community for finding communities

~Icon~ ~by~ ~@Double_A@discuss.tchncs.de~

founded 5 years ago

MODERATORS