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Gas in a syringe HTML5


Air is composed of molecules which are not linked to each other and that move freely in space. Air molecules trapped in a volume occupy all of the available space and rebound against the surfaces they meet (sides, objects, walls..). When the volume decreases or increases, the molecules move closer or farther apart from each other. The number of collisions/rebounds is directly related to the pressure.

Two experiments with one or two syringes allows for the introduction of pressure and the relation between pressure and volume.

Click and slide the plunger inside the syringe.

Learning goals

  • To understand the notion of pressure.
  • To understand the influence of volume on pressure.

Learn more

A molecule that rebounds on a surface exerts a force that pushes back onto this surface. When the number of molecules is important, the cumulative force is capable of displacing objects. This…

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