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AIM: How is volume measured?

VOCABULARY Cubic centimeter (cm3) Milliliter (mL) Liter (L) Regular shaped objects Irregular shaped objects

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OBJECTIVE

To successfully measure volumeusing the metric system for a

regularly shaped object.

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DEFINITION

What is volume ?

Volume is the amount ofspace matter (a solid, a liquid

or a gas) takes up.

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In the United States…

How is liquid volumemeasured ?

Cups, pints, quarts, ounces,gallons.

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In the Metric System…

How is liquid volume measured ?

Liters = Base (standard) unit ofmeasure for volume

We see liters and milliliters onitems we buy at the grocery store

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Both liquids and solids take upspace, so both liquids and solidshave measurements of volume

FACT: 1 milliliter (mL) takesup the same amount of spaceas a cubic centimeter (cm3)

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Basic Terminology

1 liter = 1000 milliliters

1 L = 1000 ml

a milliliter is also called acubic centimeter (cm3)

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Our instrument for measuring regularlyshaped solids….

Meterstick (ora metricruler)

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How would you calculate thevolume of a cube?

Length

Width

Heig

ht

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How would you calculate thevolume of a cube?

Volume = L x W x H

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Volume = L x W x H

So, if the Length is 2 cm and thewidth is 2 cm and the height is 2cm …

What is the Volume of this cube?

11/8/11 Volume = L x W x H

2cm x 2cm x 2cm = 8 cm3

11/8/11 Volume = L x W x H

Suppose instead of cube, we usea rectangular box …

11/8/11 Volume = L x W x H

The Length is 4cm, the width is2cm, the height is 3cm. What isthe volume ?

4 cm2 cm

3 cm

11/8/11 Volume = L x W x H

4cm x 2cm x 3cm = 24 cm 3

4 cm2 cm

3 cm

11/8/11 Regular Shaped Object

What do you think you call anobject whose L, W, and H areeasily measured?

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Regular Shaped Objects

are objects whose H, L, and W arestraight even lines and can be

accurately measured with a ruler.

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Irregular Shaped Objects

are objects that don’t have straighteven lines and can not be accurately

measured with a ruler.But…more on that tomorrow…

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Calculate the volume of …

… an object who height is 5 cm,whose length is 10 cm, and

whose width is 4 cm

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A cubic centimeter (cm3) isthe same as a milliliter (mL)

1 cm3 = 1 mL

11/8/11 Volume = L x W x H

Now – lets practice on some realobjects !!!

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