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Density- Buoyancy Goal: To use buoyancy to determine density.

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Presentation on theme: "Density- Buoyancy Goal: To use buoyancy to determine density."— Presentation transcript:

1 Density- Buoyancy Goal: To use buoyancy to determine density

2 Total Force F = mg – Fb (Fb = ρwVg)

3 W air and W water

4 Procedure Weigh an object in the air and in the water --- totally submerged. Wair Ww ---- the object is suspended by a thread from the arm of a balance

5 Density = mass / volume ρ = m / V m = ρ V
Weight of an object in the air: Wair = m g = ρ V g (1) The weight loss is due to the Buoyant force Wair - Ww = FB = ρw g V (2) ρw is the density of water

6 Get the experimental value of density
Use (1) to divide (2) Wair / (Wair – Ww) = ρ V g / ρw g V Cancel g V Wair / (Wair – Ww) = ρ / ρw ρw Wair / (Wair – Ww) = ρ ρw = 1000 kg /m^3 ρexp = 1000 x Wair / (Wair – Ww)

7 Check web to get the book value of the density
Compare and calculate the error%


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