Heat & Heat Transfer

Why wear black on sunny days?

• Dark colours absorb more radiation! ⚫🔥

• Black clothing reflects sunlight, keeping you cooler.

• Wearing black helps to prevent sunburn.

• Black is a fashionable choice for sunny weather.

Why does steam rise like your squad rushing lunch?

• Hot liquid/gas particles rise (less dense)!

• Steam is lighter than air!

• Steam is pushed upwards by the wind!

• Steam rises due to gravity!

Heat always flows from ___ to ___?

• Cold → hot

• Hot → cold

• Warm → cool

• Cool → warm

Why is a woolly jumper a heat trapper?

• It is made of synthetic fibers that retain heat.

• It has air gaps that slow conduction! 🧥❄️

• It is tightly woven to prevent air flow.

• It is designed to be worn in warm weather.

How is a kettle like a volcano?

• Both use convection currents! 🌋♨️

• Both are used for cooking food.

• Both can erupt suddenly.

• Both are found in nature.

How does the Sun ‘DM’ Earth?

• Radiation—needs no medium! ☀️📡

• Through gravitational waves 🌌

• By sending sound waves 🎶

• Using electromagnetic pulses ⚡

Why is a metal spoon the ‘class gossip’ of heat transfer?

• It conducts heat fast—particles pass energy like whispers!

• It absorbs heat slowly, making it a poor conductor.

• It reflects heat away, keeping things cool.

• It has a rough surface that hinders heat transfer.

Why put foil behind radiators?

• Reflects radiation back into room! ✨🔥

• Prevents dust accumulation!

• Enhances the aesthetic appeal!

• Increases the radiator's lifespan!

What’s the best insulator: foil, wood, or steel?

• Foil

• Wood

• Steel

• Plastic

How does double glazing work?

• The air gap reduces conduction! 🪟➖♨️

• It uses a single pane of glass to trap heat.

• It relies on a vacuum seal to prevent heat loss.

• It incorporates reflective coatings to enhance insulation.