Expt: Calculating the Buoyant Force
Aim: To calculate
the buoyant force exerted by a liquid
- Spring balance
- Empty beaker or jar
- Assorted solid objects of various shapes and sizes
- Liquids of different densities
- Take a liquid of a known density in a beaker.
- Select a solid object and attach it to a spring balance.
- Note the weight of solid. Record this as the weight of solid
- With solid still attached to the spring balance, gently
lower the spring balance to immerse the solid into the liquid in the vessel
until the solid is completely submerged or starts floating.
- Note the weight reading on the spring balance, while the
solid is still immersed. This weight will be less than the weight of the solid
in air and is known as apparent weight.
- Calculate the buoyant force by subtracting the weight in
liquid from the weight in air of the solid.
- Repeat the same procedure for liquids of different densities
and record the observations.
The buoyant force exerted by a liquid is directly proportional
to its density. The denser the liquid, higher is the buoyant force it exerts
and vice versa.