Jump to content
Sign in to follow this  
robheus

Water freezing

Recommended Posts

Assume you have two identical cups, filled with identical water and identical amount of water. The only difference being that the water in the second cup is hot, the other room temperature.

 

After placing them in a refridgerator, which one of the cups of water will freeze first, the room temperature cup or the hot cup?

 

It seems logical to say that the cup with hot water has first to cool down (although it cools down quicker because of a higher temperature gradient as the room temperature water) to room temperature, and then it would take the same amount of time for it to freeze as the room temperature water, so it would last longer for it to freeze.

 

Simple logic, isn it?

 

But please try this yourself, and investigate the answer.

 

The answer might surprise you!

 

Here is an article on this phenomena.

Edited by robheus

Share this post


Link to post
Share on other sites

If heat transfer would be so simple, we'd all have a much lower energy bill. :)

 

I think wikipedia gives a better (longer) list of possible reasons why the Mpemba effect occurs than the article you linked to.

Share this post


Link to post
Share on other sites

it is due to the fact that the molecules of hot water lose water more easily and faster then that of cold water.

 

Edited by burhan hafiz

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.