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Floating and Sinking: Hot Air Balloons

(Complete Item Description)

Abstract:: Why do hot air balloons float? This resource from the NOVA Web site offers a series of interactive activities that illustrates the physics of hot air balloons.

Subject:: Science and Technology
Grade Level:: Primary, Secondary
Collection:: Teachers' Domain

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NASA KSNN Why does ice float in my drink?

(Complete Item Description)

Abstract:: Explore the concept of density and demonstrate how the density of objects affects floating and sinking.

Subject:: Science and Technology
Grade Level:: Primary
Collection:: NASA Kids Science News Network (NASA KSNN)

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Potato Float

(Complete Item Description)

Abstract:: Understand how the same object can both sink and float, depending on its density relative to a fluid. Seawater contains many dissolved substances and these add mass to the water producing a greater mass per unit volume, or density, than that of pure water. The relationship between the density of a fluid, weight of an object, and buoyancy is critical in understanding the ocean, because density has a direct influence on the way seawater and objects in seawater behave.

Subject:: Science and Technology
Grade Level:: Secondary
Collection:: NASA

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