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Heat Transfer Challenge

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Heat Transfer Challenge

A bushwalking group is planning a warm drink stop. Use the science of heat transfer to explain what happens and choose ways to keep the drink warm. Read the information, then complete each challenge.

Heat has three ways to travel

Conduction transfers heat through direct contact, such as a hot billy warming a metal spoon. Convection transfers heat when a liquid or gas moves; warmer air or water usually rises while cooler parts sink. Radiation transfers heat by waves and does not need direct contact or moving air, as when sunlight warms your skin. Heat moves from warmer places to cooler places. Materials such as metal conduct heat well, while wood, wool and many plastics slow heat transfer.

1.Match each example to the main heat-transfer method: conduction, convection or radiation.
  • The metal spoon gets warmer where it touches the hot drink.
  • Warm air rises above the camp stove.
  • Sunlight warms the outside of the mug.
  • Hot water moves around inside the billy as it heats.
  • Convection
  • Radiation
  • Conduction
  • Convection
2.Kai holds a hand near (but not touching) a warm billy and feels warmth. Which explanation best describes heat reaching Kai's hand directly from the billy?
  • Conduction, because the billy touches Kai's hand.
  • Convection, because the billy is made of metal.
  • Radiation, because heat can travel in waves without contact.
  • Conduction, because heat only travels through solids.
3.The billy is hotter than the metal spoon. Complete the sentence: Heat travels from the to the through direct contact. Name the transfer method.
4.A woollen sleeve around a mug makes the drink heat up faster because wool is a good conductor.
TrueFalse
5.A camp billy needs a handle that will be less likely to become hot during use. Choose the best material and explain why: metal, wood or silicone.
6.Two identical mugs contain equally hot water. One is wrapped in wool and the other in a thin metal sheet. Predict which drink will stay warmer for longer, then explain your prediction using the idea of heat transfer.
7.When water in the billy is heated, warmer water rises and cooler water sinks. Explain why this movement is convection rather than conduction.
8.The group wants to find out whether a wool sleeve helps a drink stay warm. Name one thing they should keep the same for both mugs and state what they should measure.
9.The group wants to keep a drink warm while walking. Write a claim about one useful design choice, give a piece of evidence from the information on this page, and explain how the evidence supports your claim.

2 printable pages

  • Heat Transfer Challenge, page 1 of 2: Heat has three ways to travel

    Page 1

  • Heat Transfer Challenge, page 2 of 2: 5. A camp billy needs a handle that will be less likely to become hot during use. Choose…

    Page 2

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