
Introduce phase-change plateaus
Show a heating curve spanning ice, water and vapor in an introductory thermodynamics lesson. Constant-temperature segments distinguish latent heat from the temperature changes in each phase.
Explore this exampleFree Heating Curve of Water Generator Online
Explore an ideal constant-pressure water model with editable mass, temperatures and thermal parameters.
Water heating and cooling curve
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Water heating and cooling curve
Calculate sensible heat and phase-change energy for water at 1 atm.
Ideal water model at 1 atm: fixed 0 °C and 100 °C transitions, constant heat capacities and power, and no heat loss. Latent heat is included only when the range strictly crosses a transition. At a boundary, the phase follows the interior of the selected temperature interval. Cooling uses positive transferred energy and elapsed time.
Calculated points: 6
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Explore an ideal constant-pressure water model with editable mass, temperatures and thermal parameters.
A heating curve of water relates transferred energy or time to temperature and phase changes. Explore an ideal constant-pressure water model with editable mass, temperatures and thermal parameters. Ice, water and vapor stages. Melting and boiling plateaus. Temperature range controls.

Ice, water and vapor stages. Melting and boiling plateaus. Temperature range controls.
Use an ideal water model at constant pressure to show sensible heating of ice, liquid water and vapor, with phase-change plateaus at 0°C and 100°C. A temperature range crossing both transitions includes the corresponding fusion and vaporization energies.
Enter the sample mass, start and end temperatures, heat capacities and latent heats. Sensible segments use Q=mcΔT and transitions use Q=mL, so changes to the physical inputs are reflected in the calculated energy rather than in a decorative curve.
View temperature against transferred energy or elapsed time. Constant positive power sets duration through t=Q/P; cooling reverses the thermal path while reporting positive energy-transfer magnitude and duration for the selected range.
Download SVG or PNG for a thermodynamics lesson and CSV for the plotted points. JSON settings preserve the model inputs so a changed mass, temperature range or power can be compared with the original configuration.
Open the heating curve generator and choose the initial and final temperatures.
Open the heating curve generator and choose the initial and final temperatures. A rising range heats the sample; a falling range follows the corresponding cooling path through the same model.
Set mass and positive constant power, then adapt the heat capacities or latent heats when needed. The water example supplies the values used by the displayed ideal constant-pressure calculation.
Select the horizontal axis for the teaching question. The preview shows sensible temperature changes and any phase-change plateaus included by the selected temperature interval.
Export SVG or PNG for the figure and CSV for the calculated path. Save project JSON to reopen the thermal parameters and compare a different sample or heating power.
Show a heating curve spanning ice, water and vapor in an introductory thermodynamics lesson.

Show a heating curve spanning ice, water and vapor in an introductory thermodynamics lesson. Constant-temperature segments distinguish latent heat from the temperature changes in each phase.
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Change mass while keeping the temperature interval and material parameters fixed. The calculated curve gives a concrete comparison of energy required by different amounts of water.
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Use the time axis to discuss a constant-power heater. Keeping the thermal path fixed while changing power illustrates how the same energy transfer produces a different duration.
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Create rising and falling temperature paths for the same endpoints. Positive transferred-energy magnitudes allow the two directions to be compared while the curve retains its thermal direction.
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Export the plotted-point CSV alongside the figure in a worksheet. Students can connect the segment energies with Q=mcΔT and the phase transitions with Q=mL.
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Save JSON with the class model and its thermal constants. Another instructor can reopen the setup, vary a parameter and export a comparison curve for the next lesson.
Explore this exampleI used the heating curve of water to connect a temperature plot with the energy terms in our calculation. Setting the mass, endpoints and heater power produced a figure and a values table from one configuration. The exported SVG fitted the worked example, and CSV kept the segment values available beside it.
Bethany Scott
Physical chemistry lecturer · University of Durham
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