What is Volume

 Volume is defined as the amount of space taken up
by a three-dimensional object.
How do we calculate it?

 We use Length x Width x Height for regular shaped
solids.
 EX: 6 X 6 X 6
 EX: 12 x 5 x 6
How to Measure
LENGTH Review


Most metric rulers have lines indicating
centimeters and millimeters.
The centimeter lines are the longer,
numbered lines.
The shorter lines are millimeter lines.
When you use a metric ruler, line up the
0-centimeter mark with the end of the
object being measured.

How many cm? How
many mm?

How many cm? How
many mm?

Back to volume..

However, Volume often refers to liquid
volume, which is defined as the amount of
space taken up by a liquid, which spreads
completely to fill its container.
Measuring Liquid Volume

 We will use the
graduated cylinder.
 The reading must be
done to the bottom of
the meniscus.
Volume of Liquids
Reading a Meniscus
Look to the scale

Look to the scale

What if its not a regular
shape?

 We then have to measure by displacement
Measuring Volume by Displacement

 Used for irregular
shaped objects
 Select a graduated
cylinder large enough
to put the object in
 Add water - at least 10
mL and record
accurately

 SLOWLY add the object
to be measured.
 Read the new level of the
water
 The water will rise an
amount equal to the
volume of the object
What not to do

Here’s what the cylinder should look
like

Do the math

1.
2.
3.
Original reading of volume
Final volume of water
This will equal the volume of the object


22.5 mL - 17.4 mL = 5.1 mL
Therefore, the volume of the object by
displacement is 5.1 mL
How to Measure
LENGTH


Most metric rulers have lines indicating
centimeters and millimeters.
The centimeter lines are the longer,
numbered lines.
The shorter lines are millimeter lines.
When you use a metric ruler, line up the
0-centimeter mark with the end of the
object being measured.
How many cm? How
many mm?

How many cm? How
many mm?
