Lesson: Density, Mass, & Volume

​Lesson: Density, Mass, & Volume

​The amount of matter in an object or substance

​​Mass

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​The amount of gravitational pull on an object based upon it's mass

​​Weight

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​The amount of space that matter takes up

​​Volume

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​The amount of mass in a given volume

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D = M/V​

​​Density

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​Add these definitions to you notebook

Multiple Choice

What is matter?

• Anything that takes up space.

• Anything that has mass.

• Anything that takes up space and has mass.

• Anything that you can measure.

Multiple Choice

What is mass?

• The amount of a space a substance takes up.

• The amount of matter in a substance.

• The amount of substance packed into a given space.

• The mass of a substance divided by the space it takes up.

Multiple Choice

What is volume?

• The amount of a space a substance takes up.

• The amount of matter in a substance.

• The amount of substance packed into a given space.

• The mass of a substance divided by the space it takes up.

How to use Triple Beam Balance

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Multiple Choice

What is the mass shown in the picture?

• 220 g

• 222 g

• 20 g

• 200 g

All matter takes up space. The amount of space an object takes up is called its volume.

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Volume can be measured in: cubic meters (m³)

cubic centimeters (cm³)

liters (L)

milliliters (mL​).

​What is volume?

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Rectangular objects - calculate volume by using the formula:​

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Volume = Length x Width x Height.​

​Volume is measured in different ways depending on what shape the object has.

Let's practice using this formula on the next slide.

Multiple Choice

Calculate the volume of a block that is 5 m long, 6 m wide, and 2 m high.

• 10 m³

• 30 m²

• 60 m³

• 120 m³

One way would be to put the object in liquid that is inside a graduated cylinder. The liquid in the cylinder will rise the same amount as the volume of the object.

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Subtract the final liquid volume reading from the starting volume reading to find the volume of the object.​

Science tool definition: A graduated cylinder is a tall narrow cylinder with markings used to measure volume of liquids!

​So, then, how do you measure the volume of an irregular shaped object?

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​This is called the DISPLACEMENT METHOD

To calculate the density, use the following formula:

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Density = mass / volume​

(mass divided by volume)​

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​Scientists use density to measure matter because each material has a specific density.

Let's practice calculating density!

• Tool to help you remember your formulas

• ​D= M/V

• M= D x V

• V= M/D ​

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Density- Mass- Volume Triangle

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Multiple Choice

What is density?

• The amount of a space a substance takes up.

• The amount of matter in a substance.

• The amount of substance packed into a given space.

• The volume of a substance divided by the space it takes up.

Multiple Choice

Which box has a higher density?

• A

• B

• They are the same

Multiple Choice

What is the formula for calculating density?

• density = mass x volume

• density = mass / volume

• density = mass + volume

• density = mass - volume

Multiple Choice

What is the density of a liquid that has a volume of 2 mL and a mass of 50 g?

• 2ml divided by 50g= 0.04 mL/g

• 50g x 2mL= 100 g/mL

• 50g divided by 2 mL= 25 g/mL

• not enough information to find the answer

Multiple Choice

Jack has a rock. The rock has a mass of 14g and a volume of 2cm³. What is the density of the rock?

• 7 mL

• 7 g/cm³

• 28 g/cm³

• 1/7 g/cm³

The different densities of objects determines if it will sink or float in water.

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Higher density than water will SINK!

Lower density than water will FLOAT!

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The density of water is defined as 1 gram / milliliter³ ​

​What makes objects sink or float?

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​Why did the raisins sink and float in the demo?

Multiple Choice

If all masses are 20g, which material has the GREATEST volume? (Volume = mass/density)

hint: calculate the volume for each substance

• Oil

• Kool-aid

• Sprite

• Vinegar

Multiple Choice

If I cut a block of gold in half, what happens to its density?

• Density is cut in half.

• Density stays the same.

• Density doubles.

• Density cannot be determined.

Multiple Choice

What happens to the density of the balloon if volume is doubled?

• The density is cut in half.

• The density stays the same.

• The density doubles.

• Not enough information to tell.

​Compare these common substances to water, which is the most dense and which is the least dense?

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If the density is > 1, the substance will sink​

If the density is < 1, the substance will float​

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​Water has a density of ~1 g/mL or ~1 g/cm³

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Multiple Choice

If an object has a density of 0.6 g/mL and you put it into water, will it sink or float?  

• sink

• float

Multiple Choice

If an object has a density of 3.6 g/mL and you put it into water, will it sink or float?  

• sink

• float

Multiple Choice

Which of the following is the most dense?

• milk

• lamp oil

• corn syrup

• water

Multiple Choice

Which of the following is the least dense?

• honey

• water

• vegetable oil

• corn syrup

Multiple Choice

Why does ice float in water?

• The ice is more dense than the liquid water

• The ice is less dense than the liquid water

• The ice is colder, so it floats

• The liquid water is colder, so it sinks

Poll

How do you feel about calculating Density of a substance?

• I am a pro

• I am getting the hang of it

• I understand it but need more practice

• I don't understand it very much