Question 2 - A shopkeeper serves you cold lassi - Questions at the end of the chapter - Chapter 7 Class 7 - Heat Transfer in Nature (Curiosity)

Last updated at May 25, 2026 by

Q 2
Question

A shopkeeper serves you cold lassi in a tumbler. By chance, the tumbler had a small leak. You were given another tumbler by the shopkeeper to put the leaky tumbler in it. Will this arrangement help to keep the lassi cold for a longer time? Explain.

🔗 Concept: 7.1 Conduction of Heat

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Yes — the air gap slows heat entry and keeps lassi cold longer

Explanation

  • Leaky tumbler inside another creates an air gap between them.
  • Air is a poor conductor (insulator) → slows heat flow from warm surroundings to cold lassi.
  • Less heat enters → lassi stays cold for longer time.
Air gap = insulator; trapped air slows heat flow and keeps lassi cold longer.
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