# What is water displacement?

```Thank you for not chewing gum 
August 22, 2013
Materials:
Pencil, science notebook,
science folder,
Today’s Agenda:
•Bell work
•Volume lab
Objective:
Today we will practice measuring volume.
Daily Question:
What is volume and how is it measured?
What is Volume?
 Volume
is the amount of three
dimensional space an object takes
up.
 Volume can be measured in two
ways… with a ruler or by using
water displacement.
What is water displacement?


Water displacement is a technique used to
find the volume of irregular solids by looking
at how much water is displaced (pushed
aside) by the item.
Discovered by Archimedes.
 The
story takes place some 2,200
years ago when King Hieron II in
Sicily gave a jeweler a bar of gold
and ordered him to make it into a
crown.
Measuring Volume of a regular
solid

If the object has straight sides you can use a
ruler to measure the length x width x height.
 Use mm, cm or m to make your
measurements

What is the meniscus?

remember to get down to eye level.
Practice

What is the water level in this graduated
cylinder?
Measuring Volume of an irregular
solid
1.
2.
3.
Hold the object up to the graduated cylinder
to see how much water you need to cover
the object.
Pour water in the graduated cylinder to the
point needed to cover the object.
Write down the measurement before the
object is in the water.

Gently place the object in the water by tilting
the graduated cylinder slightly and sliding the
object down the side.

Measure where the water level is after the
Write down the measurement after the water
Use the following formula to calculate the
volume:


Volume = After – Before
Make a table to record your data
STATION
OBJECT
A
Green box
B
Clothes Pin
C
Yellow box
D
Golf Ball
E
NONE…
F
Purple Box
G
Candle
H
Red Box
I
Rock
LENGTH
WIDTH
(mL’s before)
HEIGHT
(mL’s after)
VOLUME
THIS IS
A
WORK
STATION
```