Density and Flotation What is density Density tells

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Density and Flotation

Density and Flotation

What is density? • Density tells us how much mass is packed into a

What is density? • Density tells us how much mass is packed into a particular volume

• Density is the mass of 1 cm 3 of a substance •

• Density is the mass of 1 cm 3 of a substance • We use 1 cm 3 so that we can make a fair comparison between substances

Remember: • Mass: The amount of matter in a body • Volume: The amount

Remember: • Mass: The amount of matter in a body • Volume: The amount of space something takes up

How do we calculate density? • Density = Mass Volume M D V

How do we calculate density? • Density = Mass Volume M D V

• Unit of density: kgm-3 or gcm-3 • How did we get this?

• Unit of density: kgm-3 or gcm-3 • How did we get this? Unit of mass Unit of volume

Flotation A solid will float in a liquid if it is less dense than

Flotation A solid will float in a liquid if it is less dense than the liquid

A liquid will float on another liquid if it is less dense

A liquid will float on another liquid if it is less dense

• When a substance changes state, its density changes too • Usually a

• When a substance changes state, its density changes too • Usually a liquid will be more dense than a gas, and a solid will be more dense than a liquid But……

• Water doesn’t follow this rule • When we freeze water, its density

• Water doesn’t follow this rule • When we freeze water, its density starts to increase • But when it reaches about 5˚C it starts to become less dense • This is why ice floats on water

Mandatory experiments • 21 A To measure the density of a solid rectangular block

Mandatory experiments • 21 A To measure the density of a solid rectangular block • 21 B To measure the density of an irregular solid • 21 C To measure the density of a liquid

To measure the density of a liquid • Find the mass of a graduated

To measure the density of a liquid • Find the mass of a graduated cylinder • Add in some water. Note the new mass and the volume • Find the mass of water by subtracting your two measurements

Can you explain what is happening here?

Can you explain what is happening here?

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