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Diffusion of Helium gas in latex balloonsFeatured science project


This experiment was conducted to ascertain how air pressure affects the rate at which helium gas escapes from latex balloons.


Lower air pressure in the surroundings will cause helium gas to escape at a faster rate, from a balloon.

Scientific Terms

Diffusion, pressure, Brownian motion


Diffusion - is the transfer of molecules from an area of high molecule density to an area of lowerdensity. In this experiment diffusion occurs when the helium gas molecules inside the balloon (are of high molecule density) move out into the airspace surrounding the balloon. The air pressure of the room in which the experiment is conducted, is varied by repeating the experiment on different levels of a tall building.

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Complexity level:
Project cost ($):
Time required:
1 day to prepare, 3 days for observation
Material availability:
Easily found
Safety concerns:

Not applicable