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Science: How to See the Invisible     6, 7, 8    To The Teacher:
First you will work with air, since it is the easiest to gas to
work with.  To ordinary experience when you look at air, nothing
is there. This lesson plan and activities and demonstrations are
designed to show how chemists know that air is composed of a gas
without necessarily knowing anything about what is in the gas.
In normal language, when you say the word fluid, what you
usually mean is a common liquid. However to chemists, a fluid
can also mean either a liquid or a gas.  The term fluid refers
to properties associated with a fluid.  Fluids flow from
container to container. A liquid assumes the shape of the
container. A gas on the other hand, has no fixed volume or
shape.  The hands on activities can be treated as either lab
activities or demonstrations which depend on time and the
availability of equipment.  Prepare th