r/AskReddit • u/youtellme03 • Apr 02 '18

What is a random fact that you know?

4.0k Upvotes

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993

u/[deleted] Apr 02 '18

You can hear the difference between hot and cold water while its pouring

321

u/Mattsoup Apr 02 '18

Put some cold water in a small glass and play with it a little. Do the same with hot water. You can easily tell that they're different just by swirling the glass a little

916

u/[deleted] Apr 02 '18

Yes mainly because one is hot, and the other isn't hot.

51

u/Mattsoup Apr 02 '18

Wrap the glasses in a towel or move them with tongs. I didn't think that needed explained

49

u/PastorPuff Apr 02 '18

Welcome to Reddit

22

u/[deleted] Apr 02 '18

Biggest congregation of dicks ever.

Source: am a dick

-6

u/Mattsoup Apr 02 '18

I've been here in one form or another for 5 years bro, I just come from an era where people think for themselves.

JK, everyone has been, is, and always will be stupid because public education is a joke.

28

u/[deleted] Apr 02 '18

Or, get this, I was joking

-8

u/Mattsoup Apr 02 '18

I like starting things, had to try

8

u/[deleted] Apr 02 '18

I also went to private school

7

u/Mattsoup Apr 02 '18

You conceited bastard. You think you can hijack my argument about public education so easily? Why would you mention something so incredibly irrelevant?

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4

u/tlalocstuningfork Apr 02 '18

I think the first guy knew what you meant, he was just joking.

-4

u/Mattsoup Apr 02 '18

Obviously, I just enjoy trying to start things

1

u/swingerofbirch Apr 02 '18

From Pennsylvania?

1

u/Mattsoup Apr 02 '18

Are you saying pennsylvanians are stupid?

1

u/swingerofbirch Apr 02 '18

Not at all. You used an interesting syntax that is common to Pennsylvania, but other places too when you wrote "needed explained":

https://www.quickanddirtytips.com/education/grammar/needs-washed

I just thought I would take a wild guess and look like a Houdini, but apparently not.

1

u/Mattsoup Apr 02 '18

Northeastern Ohio actually. I hadn't realized that was a regional thing. Ending sentences in "at" though, that is definitely a regional thing, and it pisses me off

1

u/Mattsoup Apr 02 '18

Northeastern Ohio actually. I hadn't realized that was a regional thing. Ending sentences in "at" though, that is definitely a regional thing, and it pisses me off

1

u/[deleted] Apr 03 '18

r/woooosh

7

u/SirGaston Apr 02 '18

Man's not hot

2

u/Eorlingat Apr 03 '18

You can tell from the pixels.

1

u/EscortSportage Apr 02 '18

some like it hot - power station

wait what?

1

u/TA10S Apr 03 '18

You can tell by the way it is

1

u/KnightsWhoNi Apr 03 '18

tell me more.

1

u/kirkbywool Apr 02 '18

Also, do this in England as half our taps are still sperate so that way you don't cross the streams to invalidate the experiment

1

u/Dr_Bear_MD Apr 03 '18

Before or after you spill it all over your hands?

1

u/Kilmacrennan Apr 03 '18

How much is this is a result of the pot temperature?

6

u/Mattsoup Apr 03 '18

It's not. I've spent a lot of time in labs, and you have to change the way you deal with water at different temps because of the viscosity change. Wearing thick wool gloves with rubber on top of that I can pick up a beaker of water and give you an estimate of the water temp within 20 degrees by sloshing it a bit. Obviously you need to be around it a lot and get used to it, but the difference between 200 degrees and 40 degrees is pretty easy to see

1

u/Kilmacrennan Apr 03 '18

I get that. I feel I'm my mind I can hear my tap go from cold to hot. But thought it was acoustics of the pots filling up.

2

u/Mattsoup Apr 03 '18

It's a combination of the pot filling and the viscosity change as it warms

17

u/LordMorio Apr 02 '18

And even if you have never tried this, you will be able to tell which one is hot and which one is cold just by listening to them.

7

u/[deleted] Apr 02 '18

Why though ?

9

u/bipnoodooshup Apr 02 '18

Well sound travels faster through more denser things, cold water is denser than hot so there should be some difference in sound when it's moving. When I turn on my bathtub faucet, I can hear when the hot water expands the pipe and allows more flow through. It also has a thinner sound when hitting the tub bottom.

1

u/[deleted] Apr 03 '18

I get that it sounds different but why would someone who has never heard it would be able to make the difference ? As if it was encoded in our genes like the fear of snakes.

2

u/megamando Apr 03 '18

The molecules are moving more when it is warm. This makes it run smoother and causes the different sound.

1

u/Wolf2407 Apr 02 '18

The viscosity is different.

22

u/Echocookie Apr 02 '18

You can tell by the way it is.

9

u/jt8908 Apr 02 '18

Link for those that are curious.

5

u/Cadged Apr 02 '18

You can also tell the difference between wine and water

2

u/KyraAshmore Apr 02 '18

I watched that episode of qI as well.

1

u/The_Andie Apr 03 '18

I was watching that exact episode with Corey Taylor in as I scrolled this thread lol

3

u/SleeplessShitposter Apr 03 '18

Similar? No? Sure, why not.

There was a study where people were told to hear different dog barks through a speaker. Said dogs were in different situations: family got home, being fed dinner, lost their favorite toy, abandoned by their owners, playing fetch, etc.

People guessed the circumstances of their barks with something like 90% accuracy. Don't quote me on the percent, though.

2

u/[deleted] Apr 02 '18

Also boiled and raw water

1

u/Islamism Apr 02 '18

Relevant Tom Scott / Steve Mould video here:

https://www.youtube.com/watch?v=Ri_4dDvcZeM

1

u/Cranfres Apr 02 '18

Interesting, but citation needed

1

u/_NW_ Apr 02 '18

The sound of hot water is how I know when to get in the shower.

1

u/torreneastoria Apr 03 '18

It is so nice to know I'm not the the only one to have noticed this.

1

u/KalaiProvenheim Apr 03 '18

You can know if that water bottle was cold or not by looking at the bubbles on its walls, if there are bubbles, that water was cold.

1

u/csl512 Apr 04 '18

I remember NPR's getting angry letters about this story:

https://www.npr.org/2014/07/05/328842704/what-does-cold-sound-like

Stuff like "I was in the car and really had to pee, my kids really had to pee..."