Heat Energy Removed: Latent Heat of Sublimation/Fusion

Click For Summary

Discussion Overview

The discussion centers around the heat energy removed from a liquid when vapor is no longer present, exploring concepts such as latent heat of sublimation and fusion, as well as related phenomena like subcooling and heat exchange in various scenarios.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions the heat energy removed from a liquid when vapor is absent, considering latent heat of sublimation and fusion as potential factors.
  • Another participant suggests that a clearer description of the scenario is needed, noting that generally, warmer substances lose heat to their surroundings.
  • A participant introduces the concept of subcooling, explaining it as the process of reducing the temperature of a liquid below its boiling point, and distinguishes between latent heat of fusion and latent heat of vaporization.
  • Further clarification is sought regarding conditions where only liquid is present, with examples provided, such as water in a pipe, where heat exchange occurs through conduction and convection.

Areas of Agreement / Disagreement

Participants express differing views on the specific conditions and processes involved in heat energy removal, indicating that multiple competing perspectives remain without a consensus.

Contextual Notes

Participants have not fully defined the specific conditions under which the heat energy removal is being considered, and there are unresolved aspects regarding the scenarios discussed, such as the role of vapor and the mechanisms of heat exchange.

bwd111
Messages
6
Reaction score
0
What is the heat energy removed from a liquid when vapor is no longer present. This has been bugging me all day. I was thinking latent heat of sublimation cause ice seems to just melt in a ice machine due to door opening and closing and heat from air . Next guess was latent heat of fusion
 
Science news on Phys.org
You need to better describe the scenario you are thinking about. In general if something is warmer than its surroundings it will lose heat.
 
True so It would be subcooling . Sublimation is the process of ice becoming water vapor without first going through a liquid stage.

Subcooling is reducing the temperature of a liquid below its boiling point. If you have water sitting in a pan on the stove in your house, it is subcooled liquid water. It is below 212°F.
Subcooling...latent heat of fusion relates to melting/freezing point, condensing/boiling relate to latent heat of vaporization and sublimation is a direct change of state from solid to vapor.
 
What is the heat energy removed from a liquid when vapor is no longer present.
As mathman has asked, what condition do you have where there is no vapour present and only liquid.
For example, water in a pipe has no vapor present, and heat would be exchanged through the pipe walls via conduction, and perhaps convection, to the surroundings.
 
256bits said:
As mathman has asked, what condition do you have where there is no vapour present and only liquid.
For example, water in a pipe has no vapor present, and heat would be exchanged through the pipe walls via conduction, and perhaps convection, to the surroundings.

In an ac system condenser
 

Similar threads

Undergrad What is the Role of Convective Heat Transfer in Cavitation of Cryogenic Fluids?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Is latent heat only released and absorbed as radiation?
  • · Replies 1 ·
Replies
1
Views
980
Undergrad Latent heat of fusion for water question
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad Resulting temperature of mixed liquids
  • · Replies 5 ·
Replies
5
Views
2K
Entropy of a sealed room with an open-door refrigerator
  • · Replies 5 ·
Replies
5
Views
1K
High School Would isolating the Solar System prevent its heat death?
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Latent Heat of Fusion & Internal Energy
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Heat Transferred to a Falling Object
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Latent Heat: An Alternative Explanation
  • · Replies 4 ·
Replies
4
Views
5K
High School How does sweating cool a person down?
  • · Replies 9 ·
Replies
9
Views
15K