Density Matter anything that has mass and takes

Matter: anything that has mass and takes up space Mass: the amount of matter

Facts about Density 1. All matter has density 2. Density of a specific kind

Formulas Density = Mass Volume Mass = Volume x Density Volume = Mass Density

• Density of wood is 0. 8 g/cm 3 -This means that a

What does this mean? • Therefore, a piece of steel has a mass of

What about water? • Freezing point of water = 0 degrees Celsius • Boiling

• Objects with a density LESS than water FLOAT • Objects with a

Why does ice float? 1. Frozen water (ice) is actually less dense than liquid

• This fact is what makes icebergs so dangerous. It is only “the

How can you make more dense things float in water? • Buoyancy is the

How does the Buoyant Force work? • Buoyancy allows things to float in water,

• When the buoyant force is equal to the weight of the object,

Archimedes’ Principle • States: The buoyant force on an object is equal to the

Compared to an empty ship, will a ship loaded with a cargo of Styrofoam

• • • Pre-viewing question Why do some objects float and others sink?

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Density

Matter: anything that has mass and takes up space Mass: the amount of matter present Weight: the effect of gravity on an object’s mass Volume: the amount of space matter takes up Density: the mass per unit volume of an object

Facts about Density 1. All matter has density 2. Density of a specific kind of matter is a property that helps to identify it and distinguish it from other kinds of matter.

Formulas Density = Mass Volume Mass = Volume x Density Volume = Mass Density is expressed as: g/cm 3 OR g/ml

• Density of wood is 0. 8 g/cm 3 -This means that a one cubic centimeter piece of wood has a mass of 0. 8 grams. • Density of steel is 7. 8 g/cm 3 -This means that a one cubic centimeter piece of steel has a mass of 7. 8 grams.

What does this mean? • Therefore, a piece of steel has a mass of about 9. 75 times that of wood for every 1 cubic centimeter. • Steel is MORE dense than wood.

What about water? • Freezing point of water = 0 degrees Celsius • Boiling point of water = 100 degrees Celsius • Density of water = 1. 00 g/cm 3 – Thus, fresh water has a mass of 1. 00 g for every one cubic centimeter

• Objects with a density LESS than water FLOAT • Objects with a density MORE than water SINK

Why does ice float? 1. Frozen water (ice) is actually less dense than liquid water. 2. Ice is 89% of the density of cold water. 3. This means that only about 11% of a block of ice stays above the surface of the water.

• This fact is what makes icebergs so dangerous. It is only “the tip of the iceberg” that is visible.

How can you make more dense things float in water? • Buoyancy is the ability of a fluid to exert an upward force on an object placed in it. • Buoyancy results in the apparent loss of weight of an object in a fluid.

How does the Buoyant Force work? • Buoyancy allows things to float in water, by opposing the force of gravity.

• When the buoyant force is equal to the weight of the object, the object floats or is suspended. • When the buoyant force is less than the weight of the object, the object sinks.

Archimedes’ Principle • States: The buoyant force on an object is equal to the weight of the fluid displaced by the object. – Submerged object displaces volume of fluid equal to its own volume. – Floating object displaces a volume of liquid equal to the portion that is submerged.

Compared to an empty ship, will a ship loaded with a cargo of Styrofoam float lower in water or higher in water?

• • • Pre-viewing question Why do some objects float and others sink? • Post-viewing question How was the Titanic designed to float in spite of its mass?

Titanic