Metric System

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Slide 10

Volume

Volume is the amount of space contained in an object.

We can find the volume of box shapes by the formula Volume = length x width x height

In this case the units would be cubic centimeters (cm3).

So a box 2 cm x 3 cm x 5cm would have a volume of 30 cm3

V = L x W x H

Slide 11

Base Units

The base unit for volume is the Liter.

We measure volume with a graduated cylinder.

Slide 12

Graduated Cylinders

Liquids form curved, upper surfaces when poured into graduated cylinders

To correctly read the volume, read the bottom of the curve called the meniscus

Slide 13

Liquid Volume

When the metric system was created, they decided that 1 cm3 of water would equal 1 milliliter of water and the 1 mL of water will have a mass of one gram.

1cm3 water =1 ml of water = 1 gram

Slide 14

Water Displacement

We can use water displacement to find the volume of objects that are not boxed shaped.

We can put water in a graduated cylinder. If a rock causes the level to rise from 7 to 9 ml, the the rock must have a volume of 2-mL.

Slide 15

Water Mass and Volume

1 cm3 water = 1 mL of water = 1 gram

So what would be the mass of 50 mL of water be?

50 grams

So what would be the mass of 1 liter of water be?

1 L = 1000 mL so its mass would be 1000 grams or a kilogram.

Slide 16

Density

Density is the amount of matter (mass) compared to the amount of space (volume) the object occupies.

We will measure mass in grams and

volume in ml or cm3

Slide 17

Density Formula

Density is mass divided by volume.

Density = mass/volume

Remember, all fractions are division problems.

Since the unit for mass is grams, and the unit for volume is ml or cm3, then the unit for density is g/ml, or g/ cm3

Slide 18

Density Formula Wheel

Formula wheels make it easy to solve density problems.

Cover the property you are trying to find, and do what is left over.

To find density, cover the word density. You have mass over volume remaining. So divide mass by volume to find density!

Mass