4.5.5.2

4.5.5.2 Atmospheric pressure

4.5.5.2 Atmospheric pressure

Content

The atmosphere is a thin layer (relative to the size of the Earth) of air round the Earth. The atmosphere gets less dense with increasing altitude.

Air molecules colliding with a surface create atmospheric pressure.

The number of air molecules (and so the weight of air) above a surface decreases as the height of the surface above ground level increases. So as height increases there is always less air above a surface than there is at a lower height. So atmospheric pressure decreases with an increase in height.

Students should be able to:

  • describe a simple model of the Earth’s atmosphere and of atmospheric pressure
  • explain why atmospheric pressure varies with height above a surface.


WS 1.2 Use a variety of models such as representational, spatial, descriptive, computational and mathematical to solve problems, make predictions and to develop scientific explanations and understanding of familiar and unfamiliar facts.

Resources

Video

Practicals

Practical

Demo:

Safety

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