A Science Question about Water Boiling and Freezing

[boxerjake]

Energy is neither created nor destroyed....

Certain molicules cease to vibrate at absolute zero ......... thus energy can be suspended

 

[bran987]

Certain molicules cease to vibrate at absolute zero ......... thus energy can be suspended

but absolute zero doesn't exist in real life!!!!!!!





































































except in the heart of stilleto.

 

[myway]

Somebody! Anybody! Send Lord Kelvin a pm. Is he online 2day? He could set us straight on this matter. Has anyone noticed him posting? Someone, send him a pm. Get your ass in here, William Thomson. We need u.

 

[megamania500]

It seems that everyone forgot where they were- the internet! Here's my first hit of many in Google on the subject:

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

 

[myway]

Duhhhhh! Lol. U thought of doing a search. Where have u been? Wow. That makes things a lot easier. K for common sense!

 

[hotzie]

Hot water freezes faster than cold water. Most experts say that, all things being equal, cold water freezes faster. However, things are not always equal. A curious phenomenon known as the Mpemba effect can, under some very specific (and poorly understood) circumstances, result in hot water freezing faster than cold water. One of the several possible explanations for this effect involves evaporation: if you start with extremely hot water, a good bit of it will evaporate (and a smaller quantity of water will freeze faster than a larger quantity). And so, according to chemists, this one is not a myth, and this is presumably what my high school chemistry assignment was getting at.

 

[megamania500]

Although i posted a google search website, I didn't read it. But from what I understand, though, if you put cold water and hot water into a freezer, you will see steam rising from the hot water but not the cold. As anyone who ever sweated knows, the evaporation of liquid from a wet surface will cool that surface faster than if it was dry. Thus, the evaporation occurring from the hot water (which isn't happening with the cold water) accelerates the cooling process. Thus, the hot water reaches freezing temp quicker.

Sound plausible?

 

[samoth]

answer depends on mass of water, solutes and what methods of cooling are applied. there are some circumstances in which the above statements would be true, but for the most part, this is some really dumb stuff

I laughed.

 

[Island Son]

It seems that everyone forgot where they were- the internet! Here's my first hit of many in Google on the subject:

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

A high school student with his name in the annals of scientific literature. That's pretty cool (no pun intended)

all things being equal, cool water will freeze first.
but i can see how heating a body of water will create internal convection currents; then when it's being cooled those currents will cause the internal heat to be circulated (and therefore removed) faster.

if it's due to currents, putting something in the water to prevent current formation should result in the cool water freezing first.

 

[myway]

I laughed.

I figured u would. I was wondering what took u so long.