Relationship Between Buoyancy and Density
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Transcript of Relationship Between Buoyancy and Density
RELATIONSHIP BETWEEN BUOYANCY
AND DENSITY
Why do some object float and some sink?
what is bouyancy?
Buoyancy of object is the ability of object to float when we put the object into a liquid
Buoyancy of liquid is the ability of liquid to float when we put it into a different type of liquid
buoyancy
Density of water = 1.0g/cm3
A substance that has a density lower than 1.0g/cm3 will float in water
A substance that has a density higher than 1.0g/cm3 will sink in water
Density of cork is 0.25g/cm3
Density of water is 1.0g/cm3
The density of cork is less than the density of water.
Therefore, cork floats in water
Example 1
Density of glass is 2.6g/cm3
Density of water is 1.0g/cm3
The density of glass is than the density of water.
Therefore, glass in water
Example 2
Density of kerosene is 0.7g/cm3
Density of water is 1.0g/cm3
The density of kerosene is than the density of water.
Therefore, kerosene in water
Example 3
Ice float in water. What can you say about the density of ice compared to the density of water?
We can infer the density of ice is less than the density of water
Example 4
density of water is 1.0g/cm3
Density of cork is 0.25g/cm3
Density of wax is 0.95g/cm3
Density of kerosene is 0.7g/cm3
Density of glass is 2.6g/cm3
These substances were mixed. Arrange them according to their densities.
Example 5
Density of object can be changed by changing its volume
Density of object decreased when volume increased (mass not changed)
Solving simple problems related to density
1) cooking gas cylinder and aerosol cans contain liquefied gas. Gas turns into liquid when it is kept under high pressure
Use of properties of matter in everyday life