Latent heat vaporization vs fusion

Click For Summary
SUMMARY

The latent heat of vaporization is significantly greater than that of fusion due to the differences in intermolecular forces and density changes during phase transitions. In the case of water, the density of liquid water is higher than that of ice, indicating that the intermolecular distance does not change substantially when transitioning from solid to liquid. This contrasts with the transition from liquid to gas, where a considerable increase in distance occurs, necessitating more energy input. The anomalous behavior of water plays a crucial role in these thermodynamic properties.

PREREQUISITES
  • Understanding of thermodynamic concepts, specifically latent heat
  • Knowledge of phase transitions: solid, liquid, and gas
  • Familiarity with intermolecular forces and their effects on density
  • Basic principles of water's unique properties, including its anomalous behavior
NEXT STEPS
  • Research the specific values of latent heat of vaporization and fusion for various substances
  • Explore the concept of anomalous behavior in water and its implications in thermodynamics
  • Study the relationship between density and intermolecular distance in different phases
  • Investigate the applications of latent heat in real-world scenarios, such as climate and engineering
USEFUL FOR

Students and professionals in chemistry, physics, and engineering fields, particularly those interested in thermodynamics and material properties.

SandeshPhy
Messages
25
Reaction score
0
Why is the latent heat of vaporisation greater than that of fusion(melting)?
I mean in liquid state,atoms are already far apart, so it must require less energy to make them gas(far apart) as forces(electric in nature) between molecules decrease with distance.
 
Science news on Phys.org
I don't think that atoms in liquid are far apart. Actually, when solid melts there is small change in density, implying that there isn't quite much change in intermolecular distance. e.g water is virtually densor than ice
 
ZealScience said:
I don't think that atoms in liquid are far apart. Actually, when solid melts there is small change in density, implying that there isn't quite much change in intermolecular distance. e.g water is virtually densor than ice

That is only the case for water due to anomalous behavior.
Yes there a change in density from liquid to gas change while there is little from solid to liquid.
 
And density of a phase is a god indication of intermolecular distance.
 

Similar threads

Replies
7
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 32 ·
2
Replies
32
Views
4K
  • · Replies 26 ·
Replies
26
Views
4K
  • · Replies 1 ·
Replies
1
Views
9K
  • · Replies 4 ·
Replies
4
Views
5K
  • · Replies 2 ·
Replies
2
Views
3K