# 8.10 Measure and estimate capacity

Lesson

## Ideas

Can you choose the appropriate unit to  measure capacity  ?

### Examples

#### Example 1

What is the best capacity unit to measure a cup of coffee?

A
mL
B
L
Worked Solution
Create a strategy

Apply the idea

A cup of coffee has a small amount of liquid compared to a jug of milk.

So the correct answer is A.

Idea summary

It is useful to know the capacity of some common objects so that we can estimate the capacity of new objects.

## Measure capacity

How can we measure capacity?

### Examples

#### Example 2

This vase was filled with water and then the water was poured into this measuring cup to find the vase’s capacity. What was the capacity of water in the vase?

Worked Solution
Create a strategy

Use the fact that the water in the measuring cup is equal to the amount of water in the vase.

Apply the idea

Based on the cup's markings, the water volume is 1600 millilitres.

Idea summary

If we have a measuring jug, we can fill a container, then pour it into a measuring jug to find out how much liquid it holds, its capacity.

## Estimate capacity

This video uses some everyday objects to estimate capacity.

### Examples

#### Example 3

Choose the best estimate for the capacity of a rainwater tank.

A
10 litres
B
100 litres
C
100 millilitres
Worked Solution
Create a strategy

Use the table of examples below to compare the capacity of a rainwater tank.

Apply the idea

Based on the table, the garden shed has a volume of 100 L. So the best estimate for the capacity of a rainwater tank is 100 L because a a rainwater tank and a garden shed are mostly similar in size. So, the correct answer is B.

Idea summary

If we have a measuring jug, we can fill a container, then pour it into a measuring jug to find out how much liquid it holds, its capacity. We often use millilitres (mL) and litres (L) to measure the capacity of liquids.

### Outcomes

#### MA2-11MG

measures, records, compares and estimates volumes and capacities using litres, millilitres and cubic centimetres