1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Latent heat vaporization vs fusion

  1. Dec 19, 2011 #1
    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.
  2. jcsd
  3. Dec 19, 2011 #2
    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
  4. Dec 19, 2011 #3
    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.
  5. Dec 19, 2011 #4
    And density of a phase is a god indication of intermolecular distance.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook