Heat Transfer (Conduction, Convection, Radiation)

HEAT TRANSFER (Conduction, Convection & Radiation)

Heat transfer is basically how heat moves from a hotter place to a cooler place.
And just like humans, heat has three major “transportation methods” 😭👇

1. CONDUCTION

This is heat transfer through solids, from particle to particle, without the material itself moving.

How It Works

• Particles in the hot region vibrate faster

• They bump into neighboring particles

• They pass the energy along like a hot gossip chain 😭

Examples

• A metal spoon getting hot in a pot of boiling water

• Heat traveling through a pressing iron to your clothes

• Your feet burning on hot sand

Good & Bad Conductors

• Good conductors: Metals (copper, aluminum)

• Bad conductors / insulators: Wood, plastic, rubber

2. CONVECTION

This is heat transfer in liquids and gases.
It happens because hot fluid rises and cold fluid sinks — a natural “up and down” cycle.

How It Works

• Hot fluid becomes lighter (less dense) → rises

• Cold fluid becomes heavier (more dense) → sinks

• This creates a convection current

Examples

• Boiling water circulating in a pot

• Warm air rising in a room

• Sea breeze and land breeze

• Hot air balloon lifting off

3. RADIATION

This is heat transfer without any medium — it can travel through empty space.

How It Works

Heat travels as electromagnetic waves (infrared).

Examples

• Feeling the sun’s heat even though it’s 150 million km away

• Heat from a fire warming you from a distance

• A room heater heating anything around it

Key Features

• No particles needed

• Dark, dull surfaces absorb heat more

• Bright, shiny surfaces reflect heat

SUMMARY TABLE