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KaptKid said:
I heard hot water freezes faster because of the tiny air bubbles in it.

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volcomstoner said:

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KaptKid said:
I heard hot water freezes faster because of the tiny air bubbles in it.

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agmotes165 said:
Anybody else wanna take a shot on the other side?

I am about 99.999997% sure that cold water freezes faster in all situations achievable under atmospheric pressures.

I know people who fill ice trays with hot water all the time, and they swear it freezes faster. The only way I could really see this happening is if there is significant evaporation of the water in the trays prior to reaching lukewarm/cool temperatures, thus leaving less liquid water to cool down to freezing (less total heat to remove from the liquid water portion). However, the energy removed during evaporation has to go somewhere, and the freezer still has to remove that energy...so IMO (without doing the thermo calcs) this evaporation would have little/no effect on the required time to freeze the liquid portion.

Idk...just wanted to see how many people have run into this argument, or if I just live in a section of the country with a particularly low average IQ.

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There was some old dudes talking about this exact same thing the other day at work and I'm thinking to myself "no fuckin way does hot water freeze faster than cold water" but have heard peoe
Say this and I think that they're fucking retards for believing what they heard from other retards.

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mjmihalov said:

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volcomstoner said:

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KaptKid said:
I heard hot water freezes faster because of the tiny air bubbles in it.

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fixed?

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Picklez said:
I am not watching those videos but is it really a fact?

Like hot water vs. room temperature? and how "hot" is the "hot water"

I guess you learn something new every day, even from a bunch of stoners

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Picklez said:
Learn something new every day.

What are these "circumstances?"

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Stoneth said:
Hot water freezes faster.
It's just fact.

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Stoneth said:
Last time I experienced this first hand was a month or so ago.
It got down to 9f.
I got in the shower to wash my ass, a few minutes in it became a very cold shower.

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iStoner said:
I'll test this right now for science,




My hypothesis is cold water freezes faster, as it is closer to freezing temps than hot water.

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iStoner said:
I'll test this right now for science,




My hypothesis is cold water freezes faster, as it is closer to freezing temps than hot water.

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P-O said:

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iStoner said:
I'll test this right now for science,




My hypothesis is cold water freezes faster, as it is closer to freezing temps than hot water.

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so what was your results dude?

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Shroomism said:
Hot water actually does freeze faster than cold.. called the Mpemba effect.

http://math.ucr.edu/home/baez/physics/General/hot_water.html

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P-O said:
YES

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volcomstoner said:

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P-O said:

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iStoner said:
I'll test this right now for science,




My hypothesis is cold water freezes faster, as it is closer to freezing temps than hot water.

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so what was your results dude?

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that weed makes you forget to do shit

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niteowl said:
So has no one else tried this yet?

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Thebooedocksaint said:
Sometimes you have to shrug and move on when there isn't much more to be done experimentally.

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I hear ya, and yea from a practical perspective there is no reason to be discussing this. My whole reason for starting this thread was to discuss a topic that has no definite answer. Conversations about topics that have already been ironed out and well documented are very practical, but can get boring sometimes. I have actually learned something from this thread, because I had no clue that the Mpemba effect was an observed and documented phenomena that shifted my personal opinions on the matter from "this crazy shiz can't even happen" to "maybe I should think about this more..."

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Thebooedocksaint said:
H20 actually can hydrogen bond 4 times. Donating twice (two Hydrogen, accepting twice (two lone pairs). Each one is a force of attraction between these molecules. The assumption I entertain, and the one any chemistry professor told me, was that these Hydrogen bonds are probably the reason.

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Thebooedocksaint said:
Hydrogen bonding might seem weak, but the Strands of DNA are held together through Hydrogen bonds. They are stronger than your normal Dipole-Dipole intermolecular interaction.

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This is very true. However, the reason DNA strands are solid at room temperature is because of the strong covalent phosphodiester bonds linking the "backbones" of each strand. There are also localized charges along the outside of the double helix which further increases its effective melting point. Additionally, in the center of the double helix you have 2 to 3 hydrogen bonds per base pair, all pulling toward the same central axis, this will result in a force multiplication all acting in a common direction. This is not true in a sample of H20, where all hydrogen bond forces are acting in random directions with highly variable force, meaning that the net forces acting on a single H20 molecule will be randomized and not nearly as constraining as the concerted effort of the hydrogen bonds between DNA base pairs, thereby less likely to pull and constrain a molecule into a lattice pattern. Since hydrogen bonding decreases in water at higher temperatures, this lack of effect seemingly becomes more pronounced.

The reason I'm pointing this stuff out is to provide a point-counterpoint discussion. I like discussing why a certain idea could or could not work. This was the kind of discussion I was looking for on this topic.

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Thebooedocksaint said:
Perhaps once the Crystal Matrix begins forming the slightly warmer (than cold water) interior is able to become part of the matrix faster. With all these collisions occurring more often, because of increase velocity, the chance occurrence of molecule hitting each other correctly to cause a reaction is increased.

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This may very well be the case, and in reference to your comment on the lack of experimental evidence, I believe this would be a good topic for researchers to focus on for future experiments. IMO it seems like the only reason we currently don't know why/how this effect is accomplished is simply because its not a very pronounced effect that works all of the time. This leads to lack of interest, and thus a lack of research funding. It could very well be the case that 5 years from now I'll have to say "Man that dude told me thats what was going on..."

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KaptKid said:
Damn, I posted in this thread 7 years and 10 months ago.



                       




Hope everyone is growing well     

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