• Support PF! Buy your school textbooks, materials and every day products Here!

Liquid freeze => give heat?

  • Thread starter pivoxa15
  • Start date
2,234
1
1. Homework Statement
When a liquid freezes, it gives out heat. Where does this heat come from?


2. Homework Equations
none


3. The Attempt at a Solution
Does this only apply to water or other chemical substances as well.

The heat comes from the strong bonding when as a liquid. But now this kind of potential energy stored in the bonds is released into kinetic energy hence heat outflow. This explanation is only for water as the liquid state has stronger bonding hence higher potential energy in the liquid bonds. But what about other chemical substances?
 

Astronuc

Staff Emeritus
Science Advisor
18,547
1,682
Last edited by a moderator:
2,234
1
At a molecular level, why is heat released when liquid is turned into solid? People usually explain it in terms of when solid is turned into liquid, heat is added. I want to know the other way around. Is it because there use to be a bit of kinetic energy in the molecules when in liquid state but after it has changed into a solid, this kinetic energy is lost. It can't disappear and we measure a decrease in temperture of the substance so heat must be released. We can also measure an increase in the temperture of the surrounding environment if the temperture is at or colder than the melting pt of the substance?
 
Last edited:

Related Threads for: Liquid freeze => give heat?

Replies
6
Views
3K
Replies
5
Views
2K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
2
Views
8K
Replies
2
Views
2K
  • Last Post
Replies
21
Views
3K
Replies
1
Views
6K
Replies
3
Views
9K
Top