PHYSICS HTS LESSON PLAN

Journey of Heat – From Hot to Cold

An interactive activity to explore how heat travels through conduction, convection, and radiation.

Materials Required

• Metal spoon, wooden stick, plastic ruler
• Cup of hot water
• Small candle or lamp (for radiation demo)
• Colored paper bits, thread, and needle
• Thermometer (optional)

Part 1 – Conduction

1. Place one end of a metal spoon in hot water and hold the other end.
2. Feel how the heat travels to your hand — this is conduction.
3. Now repeat with a wooden stick — heat travels much slower. Compare!

EchoLearning: “Heat travels through solids by conduction!” — Students repeat.

Part 2 – Convection

1. Take a bowl of warm water and drop in some tiny bits of colored paper.
2. Observe how the bits move — warm water rises and cool water sinks.
3. This movement of molecules shows convection currents.

EchoLearning: “Hot rises, cold sinks — that’s convection!”

Part 3 – Radiation

1. Stand near a candle flame without touching it.
2. Feel the warmth even without contact — this is heat transfer by radiation.

EchoLearning: “Heat can travel without medium — that’s radiation!”

Teacher Tip

• Discuss real-life examples: cooking utensils (conduction), sea breeze (convection), sunlight (radiation).
• Encourage students to relate each mode of heat transfer to daily life.

Observation Diagrams

Conduction — Metal spoon in hot water

Convection — Colored paper moving in warm water

Radiation — Candle flame warming your hand

Question & Answer (Interactive)

Q1. The process by which heat travels through solids?

Conduction

Q2. The process by which heat travels in liquids and gases?

Convection

Q3. The process by which heat travels without a medium?

Radiation

Q4. Which metal object conducted heat fastest in the experiment?

Metal spoon

Q5. Why does a wooden handle remain cool compared to a metal one?

Wood is a poor conductor of heat.

Q6. What movement of water was seen during convection?

Warm water rises and cool water sinks forming convection currents.

Q7. Which mode of heat transfer allows the Sun’s heat to reach Earth?

Radiation

Q8. In which mode of heat transfer does the medium itself move?

Convection

Life Lessons from Heat

• Like conduction — goodness spreads when we connect with others.
• Like convection — change begins when we rise above our comfort zone.
• Like radiation — kindness can travel even without contact.

Prepared for ICSE Class 8 — Concept link: Heat Transfer, Modes of Heat Flow (Conduction, Convection, Radiation).