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MetricSystem

Part 3Volume

What is Volume ?

• Volume is a measure of how much

space something takes up

3 Methods of Measuring Volume

• Measure the volume of a

liquid directly using

glassware

Method # 1:

Meniscus

Definition: the curved

surface of liquid in a container

Practice:

53 mL

Practice:

11.5 mL

Practice:

6.6 mL

Method # 2:

• Calculate the volume of a regularly shaped solid using geometry

Geometric Formulas:• Volume of a cube is ….

l x w x hi.e. 4cm x 5cm x 2cm = 40 cm3

i.e. x (5cm)2 x 10cm = 785 cm3

•Volume of a cylinder is ….

r2 h

NOTE:Volume can be measured in:

liters (L), milliliters (mL),

etc.

cubic meters (m3)

cubic centimeters (cm3), etc.

OR…

• It uses the decimal system (10’s!)

• It is an International Standard.

• The units relate to each other.*

*(More on this later!)

Benefits of the Metric System:

Remember this slide?

The units relate…. 1 cm1 cm3 3 = 1 mL = 1 mL

1 mL H1 mL H22OO

= 1 cm= 1 cm3 3 HH22OO

= 1 g H= 1 g H22OO

using water as a standard:

Typically,

mL or L are used to describe the volume of a liquid...

…and cm3 or m3 are used to describe the volume of a regularly shaped solid.

Method # 3:Calculate the volume of an

irregularly shaped solid using water

displacement

Use water displacementto find the volume of objects with weird shapes:

Use Water Displacement to find the volume of an irregularly shaped solid, such as a rock:

22 ml 32 ml

A formula for water displacement:

V = Vf - Vi Volume of Object =

(Final Volume) - (Initial Volume)