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📘 A heating curve maps temperature against added heat

Heat on the horizontal axis, temperature on the vertical. Rising sections warm one phase; flat sections mark a transition.

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. Read the graphIdentify rising sections and flat plateaus on a heating curve.Rising segments warm one phase; horizontal plateaus mark phase coexistence while energy enters.
  2. Name the transitionsLabel melting and boiling plateaus and compare slopes between transitions.Plateaus show two phases at once; slope depends on specific heat and heating conditions.
  3. Apply the modelAccount for pressure, choose q = mcΔT or q = mL, and apply a reading workflow.Transition temperatures depend on pressure; use the equation that matches each curve section.

Questions this course answers

What belongs on the horizontal axis of a standard heating curve?

A heating curve tracks temperature as heat or energy is added.

What does a sustained flat section usually indicate?

During a phase change, incoming energy is used in the transition rather than raising temperature.

During melting, which phases coexist in the idealized curve?

Melting is the transition from solid to liquid, so both phases are present during the plateau.

Why should pressure be checked before comparing boiling plateaus?

A liquid boils when its vapor pressure matches the surrounding pressure.

Which relation matches a phase-change plateau when latent heat is supplied per unit mass?

The latent-heat relation connects transition energy with mass and latent heat.

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