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In this activity (on page 2 of the PDF under GPS: Sailboat Design Activity), learners will discover how the shape of an object, not just its weight, determines whether it floats or sinks.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners discover that as the salinity of water increases, the density increases as well. Learners prove this by attempting to float fresh eggs in saltwater and freshwater.

1 cent - $1 per group Ages 6 - 14 5 to 10 minutes
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In this demonstration, learners observe the effects of density and pressure. A "diver" constructed out of a piece of straw and Blu-Tack will bob inside a bottle filled with water.

1 cent - $1 per group Ages 4 - adult Under 5 minutes
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In this activity, learners explore how changes in fluid pressure affect the buoyancy of a Cartesian diver inside a plastic soda bottle.

$1 - $5 per student Ages 8 - 14 10 to 30 minutes
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In this activity (on page 2), learners create a submarine using a plastic cup. This is a fun way to learn about buoyancy and density.

$1 - $5 per student Ages 8 - 14 10 to 30 minutes
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In this ocean engineering activity, learners explore buoyancy and water displacement. Then, learners design models of deep sea divers that are neutrally buoyant.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners use tinfoil to build and test their own boats - which designs will float, and which will sink?

1 cent - $1 per student Ages 6 - 11 45 to 60 minutes
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In this activity on page 24, learners perform experiments to examine whether or not trash can float, blow around, or wash away.

1 cent - $1 per group Ages 6 - 14 30 to 45 minutes
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In this activity, learners are challenged to design a planktonic organism that will neither float like a cork nor sink like a stone.

$5 - $10 per group Ages 8 - adult 30 to 45 minutes
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In an investigation called "Shape It!" learners craft tiny boats out of clay, set them afloat on water and then add weight loads to them, in order to explore: how objects stay afloat in water; what th

$1 - $5 per group Ages 8 - 14 30 to 45 minutes
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In this activity about humans and space travel (page 1 of PDF), learners compare and contrast the behavior of a water-filled plastic bag, both outside and inside of a container of water.

1 cent - $1 per group Ages 6 - 11 45 to 60 minutes
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In this investigation, learners explore the force known as buoyancy by placing various objects into water and observing how they behave (for example, which sink more quickly, which float, how much wat

$1 - $5 per group Ages 8 - 14 30 to 45 minutes
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Learners create three solutions with different levels of salinity. They compare the density of these solutions by coloring them and layering them in a clear plastic cup and in a soda bottle.

$1 - $5 per group Ages 8 - 18 10 to 30 minutes
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Based of the The Tech Challenge 2015, learners will engage in two mini-design challenges related to seismic engineering.

$1 - $5 per student Ages 8 - adult 30 to 45 minutes
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Learners classify a variety of objects by their characteristics. They then design an experiment to determine which objects float or sink in water and add this characteristic to their classification.

$5 - $10 per group Ages 8 - 11 45 to 60 minutes
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In this two-part activity, learners investigate buoyancy, density and surface area as well as biodiversity and the relationship between the structure and function of organisms.

Over $20 per group Ages 8 - 18 1 to 2 hours
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Design a vessel that tests the limits of wind power given a set of off the shelf and recycled materials.

1 cent - $1 per student Ages 6 - adult 30 to 45 minutes
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Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

$5 - $10 per group Ages 4 - 14 30 to 45 minutes
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In this design challenge activity, learners use two helium-filled balloons to build a blimp that can travel in a straight path across the room.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this physics activity, learners will explore buoyancy.

1 cent - $1 per student Ages 4 - adult 10 to 30 minutes