Lesson 26: Choose Suitable Materials

We use heat insulators to keep things hot or cold. These heat insulators trap air and therefore, cuts down heat from going through the material.

( A ) Polystyrene material

  • contain trapped air
  • good insulators of heat
  • used to make food containers
( B ) Towel
  • used to wrap hot things to keep them warm
  • used to wrap frozen things to keep them cold

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