PhysicsChapter 2: Thermal Expansion and Change of State
Fusion (melting)
On the 0 C plateau, heat goes into breaking the ice lattice, not into raising temperature.
Learning objectives
- Define and explain fusion (melting).
- Apply fusion (melting) to a focused FBISE question.
- Check the answer for correct terms, evidence, working, and units.
Definition
On the 0 C plateau, heat goes into breaking the ice lattice, not into raising temperature. For water, Lf is about 3.34 x 10^5 J/kg. The same energy is released when 1 kg of water freezes.
Where / symbols
- Fusion (Melting)
- On the 0 C plateau, heat goes into breaking the ice lattice, not into raising temperature. For water, Lf is about 3.34 x 10^5 J/kg. The same energy is released when 1 kg of water freezes.
Overview
Learn the idea, then use it:
Core Understanding
On the 0 C plateau, heat goes into breaking the ice lattice, not into raising temperature. For water, Lf is about 3.34 x 10^5 J/kg. The same energy is released when 1 kg of water freezes.
Examples 0 C plateau · breaking the lattice · constant temperature · FUSION (MELTING): On the 0 C plateau, heat goes into breaking the ice lattice, not into raising temperature. For water, Lf is about 3.34 x
Exam Application
State the correct term, connect it to the chapter rule or evidence, and use a clear example or calculation.
Examples Define first · Show the rule or evidence · Check units, labels, and conclusion
WHAT — FUSION (MELTING)
On the 0 C plateau, heat goes into breaking the ice lattice, not into raising temperature. For water, Lf is about 3.34 x 10^5 J/kg. The same energy is released when 1 kg of water freezes.
HOW — Use the idea
Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check the result.
In simple words
Do not merge fusion (melting) with a neighbouring idea that uses a different definition, rule, or method.
Key points
- 0 C plateau
- breaking the lattice
- constant temperature
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Fusion (melting)
Sticky Notes · Quick Revision
Core Idea
- On the 0 C plateau, heat goes into breaking the ice lattice, not into raising temperature.
Key Points
- 0 C plateau
- breaking the lattice
- constant temperature
Simple Check
- Explain fusion (melting) in your own words and connect it to one chapter example.
How to Answer
- Define the idea, show the main rule or evidence, apply it, and check the final statement.
Common Mistake
- Do not merge fusion (melting) with a neighbouring idea that uses a different definition, rule, or method.
FBISE Exam Tip
- Use the exact term, show working where needed, and include units or labelled evidence.
60-second revision
- On the 0 C plateau, heat goes into breaking the ice lattice, not into raising temperature.
- 0 C plateau
- breaking the lattice
- constant temperature
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