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Convection
Convection transfers thermal energy through the bulk movement of a fluid.
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Convection
Warm fluid rises and cooler fluid moves down to replace it.
Recommended for Class 10
Convection
Convection
Convection transfers thermal energy through the bulk movement of a fluid.
Fluids include liquids and gases.
Heating usually causes fluid expansion and a decrease in density. Warmer fluid rises, while cooler, denser fluid moves downward.
This circulation creates a convection current.
Sequence
Heating → expansion → lower density → rise → cooler fluid sinks → circulation
Natural and Forced Convection
Natural convection: driven by density differences.
Forced convection: driven by fans or pumps.
Convection — Advanced
Convection couples heat transfer with fluid mechanics. Density differences create buoyancy forces that drive natural convection.
Common Mistakes
Common Mistakes
- Mistake
Ordinary bulk convection does not occur in solids.
- Mistake
Do not confuse convection with conduction.
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Practice
PQ
Q1. Define convection.
PQ
Q2. Describe a convection current.
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Q3. Why does heated fluid rise?
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Q4. Differentiate natural and forced convection.
PQ
Q5. Give two examples.
Exam Practice
EQ
Q1. Define convection.
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Q2. Explain formation of convection currents.
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Q3. Explain the role of density.
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Q4. Differentiate natural and forced convection.
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Q5. Give an everyday example.
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.