Latent heat in water vapor below boiling

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SUMMARY

The latent heat of vaporization for water varies with temperature, decreasing as it approaches the critical temperature of approximately 374°C. At standard atmospheric pressure, the heat of vaporization is significant below this temperature, with only minor changes in values at temperatures well below the critical point. A referenced PDF provides detailed data on the heat of vaporization at various temperatures ranging from 0°C to the critical temperature.

PREREQUISITES
  • Understanding of latent heat and phase changes in thermodynamics
  • Familiarity with the concept of critical temperature
  • Basic knowledge of temperature scales (Celsius and Kelvin)
  • Ability to interpret scientific data from graphs and tables
NEXT STEPS
  • Research the heat of vaporization values for water at specific temperatures using reliable scientific sources
  • Explore the relationship between temperature and latent heat in other substances
  • Study the implications of latent heat in meteorology and climate science
  • Investigate the critical temperature concept in different materials beyond water
USEFUL FOR

Students and educators in physics, researchers in thermodynamics, and professionals in meteorology or environmental science seeking to understand the properties of water vapor and its behavior under varying temperatures.

ceilidhdad
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Hi -

I'm a physics newbie so this is an elementary question, but I can't find the answer with a google search.

Water evaporates at a wide range of temperatures, what is the latent heat in the water vapor (in calories or Joules), for example, at 30°C, 60°C? Assume standard atmospheric pressure. Does it change at different ambient temperatures?

Thanks!

Adam
 
Science news on Phys.org
The heat of vaporization does change with temperature, approaching 0 at the critical temperature (which for water is about 374 C). The rate of change is relatively small when the temperature is well below the critical temperature, though.

This page has a link to a PDF with the heat of vaporization at various temperatures between 0 C and the critical temperature.
 

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