PhysicsChapter 2: Thermal Expansion and Change of State
Humidity
Relative humidity compares the vapour actually present with the maximum the air can hold at that temperature.
Learning objectives
- Define and explain humidity.
- Apply humidity to a focused FBISE question.
- Check the answer for correct terms, evidence, working, and units.
Definition
Relative humidity compares the vapour actually present with the maximum the air can hold at that temperature. Warm air can hold more vapour. Very humid air slows sweat evaporation, so you feel hotter.
Where / symbols
- Humidity
- Relative humidity compares the vapour actually present with the maximum the air can hold at that temperature. Warm air can hold more vapour. Very humid air slows sweat evaporation, so you feel hotter.
Overview
Learn the idea, then use it:
Core Understanding
Relative humidity compares the vapour actually present with the maximum the air can hold at that temperature. Warm air can hold more vapour. Very humid air slows sweat evaporation, so you feel hotter.
Examples vapour actually present · warm air holds more · collisions · HUMIDITY: Relative humidity compares the vapour actually present with the maximum the air can hold at that temperature. Warm air c
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 — HUMIDITY
Relative humidity compares the vapour actually present with the maximum the air can hold at that temperature. Warm air can hold more vapour. Very humid air slows sweat evaporation, so you feel hotter.
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 humidity with a neighbouring idea that uses a different definition, rule, or method.
Key points
- vapour actually present
- warm air holds more
- collisions
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Humidity
Sticky Notes · Quick Revision
Core Idea
- Relative humidity compares the vapour actually present with the maximum the air can hold at that temperature.
Key Points
- vapour actually present
- warm air holds more
- collisions
Simple Check
- Explain humidity 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 humidity 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
- Relative humidity compares the vapour actually present with the maximum the air can hold at that temperature.
- vapour actually present
- warm air holds more
- collisions
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