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In this introductory demonstration and activity, learners are introduced to the concept of density as they explore a rock and a wooden block in water.

In this demonstration, learners observe as a bottle is placed on a table with wooden hoop balanced on top and a pencil balanced on top of the hoop.

In this math lesson, learners analyze the density of liquids in order to explore linear functions.

Learners set up three different bowls, each with a different mass of oatmeal. Learners monitor the temperature of the oatmeal and find that larger masses take longer to cool.

In this activity, learners measure the amount of carbon dioxide in a carbonated drink.

Learners build simple catapults and use them to launch cotton balls.

Learners investigate weight by building a spring scale. They observe and record how it responds to objects with different masses.

Learners drop two different masses of play dough and observe how long it takes them to hit the ground.

In this activity, learners will explore density and it's relationship with mass.

The demonstration/experiment provides quick proof that air has mass.

Learners will understand the relationship between climate change and sea-level rise.

Learners assemble a hot-air balloon from tissue paper. The heated air (from a heat gun) inside the balloon is less dense than the surrounding air and causes the balloon to float.

In this activity, learners conduct an experiment to find out if steel wool will weigh more or less when it is burned. Learners will explore the effects of oxidation and rusting on the steel wool.

In this physics activity (page 6 of the PDF), learners will demonstrate air has weight by comparing an inflated balloon to a deflated one.

In this activity, learners determine the elastic and plastic properties of different types of metal wires.

In this activity, learners predict whether a ball on Earth or a ball on the Moon bounces higher when dropped and why.

In this activity, learners use colored candy to represent subatomic particles and make a model of an atom (Bohr model).

In this activity, learners explore the concept of density by pouring 5 different liquids into a jar. Food coloring is added if needed to give each liquid a distinct color.

Learners make a mobile model of a carbon atom using clay, wire, and pipe cleaners.

In this chemistry activity, learners discover that the weight of the product of combustion is greater than that of the starting material.