# A humble question

1. Sep 14, 2006

### unscientific

Does ice melt or remain frozen at 0 degree celcius?

2. Sep 14, 2006

### tehno

He,he,he :Both!

3. Sep 14, 2006

### masudr

Thanks to latent heat (look up Clausius-Clapeyron equation for more details)

4. Sep 14, 2006

### Bystander

Are you adding or removing energy (heat)? Are you increasing or decreasing pressure?

5. Sep 18, 2006

### unscientific

no energy is removed or added and pressure is at a constant 1 atm.

6. Sep 18, 2006

### Farsight

7. Sep 18, 2006

### DaveC426913

Tehno is right, it does do both. Molecules are constantly joining and departing from the surface at the same time. The ratio stays about the same unless the temp is added or removed.

8. Sep 18, 2006

### Claude Bile

9. Sep 18, 2006

### Epicurus

H20 does not have a triple point at atmospheric pressure.

10. Sep 18, 2006

### scarecrow

lol...if that was the case we'd be dead.

11. Sep 18, 2006

### Epicurus

In general there is a coexistence region whereby two phases will be simultaneously present. This happens over an extended temperature range and if predicted by the van der Waals equation of state. I am unsure what this is for water but there is no definate point at which we have either a totally water or totally ice, just proportions of either.

12. Sep 18, 2006

### castaway

oops i didnt read that pressure will be constant , sorry... well ice will start melting atzero degree celsius

13. Sep 19, 2006

### unscientific

so does it remain frozen...or does it start to melt???

14. Sep 19, 2006

### Staff: Mentor

It takes energy to melt ice. If you don't add any, the ice won't melt.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook