Project 1 — Fix a balloon over

Last updated at June 17, 2026 by

Project 1
Project

Fix a balloon over the neck of a bottle and put the bottle in hot water. Explore what will happen?

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Key Points
The balloon inflates as the warm air expands.

Key Points / Good Practices

  • Hot water warms the air inside the bottle.
  • On heating, the air particles gain energy and move faster.
  • They spread out and need more space.
  • The expanding air pushes into the balloon and inflates it.
  • Try cool water too and compare what happens.
  • Handle the hot water carefully with an adult's help.
Heating makes gas particles spread out, so the warm air inflates the balloon.
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CA Maninder Singh

CA Maninder Singh is a Chartered Accountant with 16+ years of practical experience and 20+ years of teaching experience. At Teachoo, he simplifies Accounts, Tax and GST with step-by-step examples so students can apply concepts confidently in exams and real life.

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