What does “Phase change and latent heat” actually mean in Thermal Properties of Matter, and why does it matter for JEE?
During an ideal phase change at fixed pressure, supplied heat rearranges particles instead of raising temperature, so temperature stays constant until the change finishes.
In simple words: During an ideal phase change at fixed pressure, supplied heat rearranges particles instead of raising temperature, so temperature stays constant until the change finishes. Getting Phase change and latent heat clear matters because JEE questions on Thermal Properties of Matter usually test this idea directly, not just a formula you memorised.
Key point
Phase change and latent heat
Common mistake
using Q = mc Delta T through the melting or boiling plateau.
Memory tip
sloping graph: mc Delta T; flat phase-change graph: mL.
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