Posted on 10/23/2017 10:29:39 AM PDT by Red Badger
No, you’re supposed to chill it overnight, then freeze it. :)
We didn’t want to wait.................
The girl with Mpemba keeps walkin...
Are we to believe that water molecules have a 'memory' for its 'previous history?'
Nonsense.
It’s very tricky.
And you have to hold your tongue just right.................
So, it’s kind of like momentum for temperature. If it is already out of equilibrium, even if it is in the wrong direction, it is easier to “push” the system to a new equilibrium point.
“who do you think would get to LA first?”
You left out the variable of how fast the driver leaving Denver to LA can drive.
So the warmer earth gets via Global Warming the quicker it will cool down.... COOL!!!!
BWAHAHAHAHA!!
The article referenced sounds like a load of BS.
There is a grain of truth in the old wives tale, however.
Take two ice cube trays. Fill one with just boiled hot water, the other with tap water.
Put them both in the freezer. See which one has ice cubes faster. Surprise!
The just-boiled water filled tray will have almost nearly evaporated away, and have tiny cubes. So this is merely an exercise in evaporation. Fill two sealed containers, hot water bottles, and then things are much different.
If an equal amount of hot water and colder water are placed in a freezer at the same time, the colder water freezes first. Consider this: The hotter water can not freeze first because for it to do so it would at some point have to be colder than the colder water, and then it would not be the hotter water any more! The original colder water would now be the hotter water. It should freeze first! This is inconsistent logically. Hence, colder water freezes quicker than warmer water of an equal amount.
I’m still wanting someone to explain what happens when
you crack an ice tray in the dark and get flashes of light.
Noticed this many years ago.
triboluminescence
You need to normalize for the pressure inside of the sealed container, which will affect the freezing point.
Perhaps a stretchable container such as a hot water bottle would normalize the pressure inside the vessel.
How about:
The hotter molecules have more energy so they hit the sides of the container more often draining their energy?.............
All I can say is if you actually try it, instead of just writing about it, the hot water will make cubes faster than cold water.
Logically this is utter nonsense.
The reason they can’t duplicate it is because at some point the warmer liquid or gas reaches the same temperature as the cooler liquid and by then the cooler substance is ahead in the process while the warmer is just at the starting point.
There is no Momentum in cooling or heating. Heating and cooling is addition or removal of heat, Period. It is measured in BTU’s or Calories or whatever measurement you want. It is really very simple math.
This article is ridiculous.
When I a was in college a roomate’s high school age brother claimed this and we did the experiment. Of coarse cold first.
But you got me thinking...what about evaporation? Jump in Lake Powell when it’s 104 and you’ll stay cool until your dry.
Got me looking for answers. Found the Mpemba effect. Takes in account evaporation, dissolved gases, convection and surroundings. Interesting.
Not a great idea to dismiss Aristotle. LOL!
“but only 50 mph from Denver on ...”
btt
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