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The Challenge

Design and build a thermos/cup that can keep 250 ml of water the warmest for 30 minutes.

Design Constraints

  • Fit in your teacher’s hand

  • Must hold 250 mL of hot water

  • Be structurally sound (doesn’t easily fall apart)

  • No part of your container may be permanently altered as a result of the final test (your results must be repeatable without changing your container.)

  • The container that shows the lowest change (i.e. keeps water the warmest) wins!

You may:

  • Use a plastic/glass/ceramic cup as the core

  • Use any raw materials at home or from the store as long as they obey the “May NOT” section. 

You may NOT:

  • Use a thermos/travel mug as the core
  • Use materials only accessible to research laboratory personnel
  • Use a top/cap/lid that completely seals the thermos. 
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