Why Does Temperature Remain Constant When Water Boils?

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SUMMARY

The discussion confirms that when water boils, the temperature remains constant at 100 degrees Celsius despite continuous heat energy transfer. This occurs because the energy is utilized for the phase change from liquid to steam rather than increasing the temperature. The temperature-time graph illustrates a linear increase to 100 degrees Celsius over the initial 6 minutes, followed by a horizontal line indicating constant temperature during the subsequent 4 minutes of boiling.

PREREQUISITES
  • Understanding of heat transfer principles
  • Familiarity with phase changes of matter
  • Basic knowledge of temperature measurement
  • Graph interpretation skills
NEXT STEPS
  • Research the concept of latent heat of vaporization
  • Explore the Clausius-Clapeyron equation for phase changes
  • Learn about the specific heat capacity of water
  • Investigate the effects of atmospheric pressure on boiling point
USEFUL FOR

Students in physics or chemistry, educators teaching thermodynamics, and anyone interested in the principles of heat transfer and phase changes.

physgirl
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So if heat energy is transferred at a constant rate until the water reaches its boiling point temperature (in 6 min let's say)... and then heat energy is transferrred at the same rate as the water boils for the next 4 min...

would the graph of time v. temperature look like: a straight line with constant slope going from original water temperature to 100 degrees in the first 6 minutes and then a straight horizontal line b/w 6 min and 10 min?

also, if that is correct, for the last 4 minutes, is the temperature constant despite the heat energy transfer because... the energy was being spent on changing water to steam rather than increasing the temperature?
 
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