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Build A Hydrometer
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In this activity, learners will explore how a hydrometer works by building a working model and conducting experiments.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-273.jpg?itok=ATQYHqLY)
Dissolving Different Liquids in Water
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In this activity, learners add different liquids to water and apply their working definition of “dissolving” to their observations.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-328.jpg?itok=o0rFbYSp)
Changing the Density of an Object: Adding Material
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Learners see that a can of regular cola sinks while a can of diet cola floats. As a demonstration, bubble wrap is taped to the can of regular cola to make it float.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-577.jpg?itok=gPS3XS36)
Milk Carton Boats
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This activity (on page 2 of the PDF SciGirls Activity: Milk Carton Boat) is a full inquiry investigation into boat hull design.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-968.jpg?itok=m9bVq5Ur)
Life Vest Challenge
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In this activity, learners explore the engineering behind life vests or personal flotation devices and the challenges met by these devices.