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When two objects touch, which way does heat flow?

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  1. From the colder one to the hotter one
  2. From the bigger one to the smaller one
  3. From the hotter one to the colder one

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References

  1. NASA Glenn Research Center: Heat Transfer www.grc.nasa.gov/www/k-12/airplane/heat.html Checked 2026-10-10.

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