## What is capacity?

**Capacity** refers to the amount that can be held in a container. Capacity can be measured in metric units or customary units.

**Metric unit of capacity:** The standard metric unit of capacity is the liter. From the liter, we get the rest of the metric units

**Note:** All of the other metric units of capacity are defined in terms of the liter.

### Let’s understand the metric units of capacity, what they are in actuality.

#### Liter

The abbreviation for **liter** is** ‘L’.**

**1 liter** is equal to** 1000 Milliliter.**

**1 liter **capacity is the same as the** amount of water in a drinking water bottle.**

#### Milliliter

It is a very small unit of liquid.

The abbreviation for **milliliter **is **‘’ml’.**

**1 milliliter** quantity is the same as **20 drops**.

### Some basic metric units of capacity and relation between

### Conversion between the metric units of capacity

### Problem

Carla has 4500 mL of cold drink. How many liters of cold drink does she have?

**Examples:**

1. 15 L = _____ mL.

2. 2½ mL = _____L.

3. 0.44 mL = _____L.

4. 2.7 L = ___mL.

**Solution:**

**1. Since, 1 L = 1000 mL **

So, 15 L = 15 × 1000

= **15000 mL**

**2. Since, 1 L = 1000 mL or 1000 mL = 1 L **

So, 1 mL = 1 ÷ 1000 L or 1 mL = 0.001 L

Now, for 2½ mL or 2.5 mL = 2.5 × 0.001

= **0.0025 L**

**3. Since, 1 L = 1000 mL or 1000 mL = 1 L **

So, 1 mL = 1 ÷ 1000 L or 1 mL = 0.001 L

Now, for 0.44 mL = 0.44 × 0.001

= **0.00044 L**

**4. Since, 1 L = 1000 mL **

So, 2.7 L = 2.7 × 1000

= **2700 mL**

**Example 1:**** **Bernice made 1050 ml of gravy to go with her 5 kg turkey. The capacity of the gravy dish is 540 ml. How much gravy will be left in the pot after Bernice fills up the gravy dish?

**Solution: **

1050 – 540

= 510

**510 mL **of gravy will be left in the pot.

**Example2:** I buy 10 L of milk. I use half of it. How many milliliters do I have left?

**Solution: **

Total quantity of milk = 10 L

As half quantity is already used so, remaining quantity = 5L

Now, quantity in mL = 5 × 1000 mL

= **5000 mL **

### Concept Map

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