PhysicsChapter 2: Thermal Expansion and Change of State
Vaporisation (boiling)
On the 100 C plateau at 1 atm, heat goes into separating molecules into steam.
Learning objectives
- Define and explain vaporisation (boiling).
- Apply vaporisation (boiling) to a focused FBISE question.
- Check the answer for correct terms, evidence, working, and units.
Definition
On the 100 C plateau at 1 atm, heat goes into separating molecules into steam. Lv for water is much larger than Lf (about 2.26 x 10^6 J/kg). Steam burns are severe because that energy is dumped on the skin as steam condenses.
Where / symbols
- Vaporisation (Boiling)
- On the 100 C plateau at 1 atm, heat goes into separating molecules into steam. Lv for water is much larger than Lf (about 2.26 x 10^6 J/kg). Steam burns are severe because that energy is dumped on the skin as steam condenses.
Overview
Learn the idea, then use it:
Core Understanding
On the 100 C plateau at 1 atm, heat goes into separating molecules into steam. Lv for water is much larger than Lf (about 2.26 x 10^6 J/kg). Steam burns are severe because that energy is dumped on the skin as steam condenses.
Examples 100 C plateau · Lv much larger than Lf · constant temperature · VAPORISATION (BOILING): On the 100 C plateau at 1 atm, heat goes into separating molecules into steam. Lv for water is much larger than Lf (abou
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 — VAPORISATION (BOILING)
On the 100 C plateau at 1 atm, heat goes into separating molecules into steam. Lv for water is much larger than Lf (about 2.26 x 10^6 J/kg). Steam burns are severe because that energy is dumped on the skin as steam condenses.
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 vaporisation (boiling) with a neighbouring idea that uses a different definition, rule, or method.
Key points
- 100 C plateau
- Lv much larger than Lf
- constant temperature
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Vaporisation (boiling)
Sticky Notes · Quick Revision
Core Idea
- On the 100 C plateau at 1 atm, heat goes into separating molecules into steam.
Key Points
- 100 C plateau
- Lv much larger than Lf
- constant temperature
Simple Check
- Explain vaporisation (boiling) 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 vaporisation (boiling) 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 100 C plateau at 1 atm, heat goes into separating molecules into steam.
- 100 C plateau
- Lv much larger than Lf
- constant temperature
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