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In this activity, learners make a yeast-air balloon to get a better idea of what yeast can do. Learners discover that the purpose of leaveners like yeast is to produce the gas that makes bread rise.

Learners test two jars, one containing plain air and one containing carbon dioxide gas, to see their reactions to temperature changes.

In this meteorology activity, learners construct simple devices to measure the direction and speed of wind.

In this physics demonstration, learners will be surprised when a handkerchief holds water in an upside-down glass.

In this activity, learners will experiment with water- and air-filled balloons as a way of dampening sound before it reaches their ears.

In this activity (last activity on the page), learners make a model of the eardrum (also called the "tympanic membrane") and see how sound travels through the air.

Conduct a simple experiment to explore how temperature changes can make things expand or contract.

Learners build a simple hovercraft using air from a balloon to levitate a craft made from a compact disc (CD).

In this challenge, learners make a helium balloon hover in one spot and then move it through an obstacle course using air currents.

In this activity, learners use simple items to construct a device for indicating air pressure changes.

In this activity, learners build handheld rockets and launchers out of PVC pipes and plastic bottles. Use this activity to demonstrate acceleration, air pressure, and Newton's Laws of Motion.

In this activity, learners use simple items to construct a device for indicating air pressure changes.

In this activity, learners (at least three) work together to explore the effects of atmospheric pressure.

"Molecules in Motion" explores how materials behave and change in a vacuum.

In this activity, learners try to blow up a balloon hanging inside of an empty bottle.

Demonstrate the Bernoulli Principle using simple materials on a small or large scale.

In this activity, learners discover a trick to release the air out of a balloon without popping it.

In this activity, learners will create a model rocket out of an inflated balloon attached to a straw on a taught string.

In this activity (on page 2 of the PDF under GPS: Luge Activity), learners will construct a model hovercraft out of an empty spool and a piece of cardboard.

In this physics demonstration, learners will be surprised when a lemon slice appears to magically levitate within a pint glass.