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Heat and volume of gases-Balloon in a Flask (Mahya Babaie)


Mahya Babaie

         Principle(s) Illustrated

  1. Principle 1: Temperature and heat transfer
  2. Principle 2: Ideal gas law


  • 9-12. 4.c. Students know how to apply the gas laws to relations between the pressure, tem­ perature, and volume of any amount of an ideal gas or any mixture of ideal gases.
  • 9-12. 4. b. Students know the random motion of molecules explains the diffusion of gases.
  • 9-12. 4.a. Students know the random motion of molecules and their collisions with a surfacecreate the observable pressure on that surface.

Questioning Script

Prior knowledge & experience:

Gas molecules are in constant motion.When the kinetic energy increases the motion of the gas molecules increases. When the kinetic energy increases the motion of the gas molecules increases.

Root question:

Why did the balloon went inside the bottle?

Target response:

                      we are focusing on temperature and heat 
                transfer. When the flask is cooling off, the air 
                inside the flask is cooled. This causes the air 
                molecules to move slower and closer 
                The air molecules contracts and causes the 
                outside air to rush in. This pulls the balloon   
                inside the bottle and inflates it. 

Common Misconceptions:

The gas molecules are gonna fill up the balloon.

          Photographs and Movies



You tube demonstration: 

YouTube Video

Reference 2 (National Weather Service Forecast Office)