# Metric Volume

These are the two most common measurements:

• Milliliters
• Liters

A milliliter (that is "milli" and "liter" put together) is a very small amount of liquid.

Here is a milliliter of milk in a teaspoon.

It doesn't even fill the teaspoon!

If you collect about 20 drops of water, you will have 1 milliliter:

 20 drops of water make about 1 milliliter

And a teaspoon can hold about five milliliters:

 1 teaspoon of liquid is about 5 milliliters

Milliliters are often written as ml (for short), so "100 ml" means "100 milliliters".

They can also be written mL (with a captal L so it doesn't look like "1")

Here we have 150 ml of milk in a measuring cup.

It doesn't say "150" ... it says "50" ... but it is half-way between 100 and 200 so you can figure out it is 150 ml.

## Liter

A liter is just a bunch of milliliters put all together. In fact, 1000 milliliters makes up 1 liter:

1 liter = 1,000 milliliters

This jug has exactly 1 liter of water in it.

Liters are often written as L (for short), so "3 L" means "3 Liters" (some people use lowercase l, but that looks too much like 1).

Milk, soda and other drinks are often sold in liters.

 A cube that is 0.1 meters (10 cm or 100 mm) on each side contains 1 liter,
 and a square meter that is 1 millimeter thick also contains 1 liter.

The next time you are at the store take a minute and look on the labels to see how many liters (or milliliters) are in each container!

## Other Volume Measurements

You may come across these other volume measurements:

### Cubic Millimeter

A Cubic Millimeter is a cube that is 1 millimeter on each side.

It is very small, and we need 1,000 Cubic Millimeters to make just one milliliter.

It is also one-millionth of a liter, and one-billionth of a cubic meter.

### Cubic Centimeter (cc)

A Cubic Centimeter (abbreviated cc or cm3) is a cube that is 1 centimeter on each side.

It is the same as 1 milliliter (1 ml):

1 cc = 1 ml

So it is one-thousandth of a liter, or one-millionth of a cubic meter.

### Cubic Meter (m3)

The basic unit of volume is a cube that is 1 meter on each side.

The Unit is written m3 (cubic meters).

It is equal to 1,000 liters.

1 m3 = 1,000 Liters

### Megaliters (ML)

A Megaliter is a million liters (1,000,000 L). Useful for measuring large quantities of water, such as in dams and small lakes.

1 ML = 1,000 m3 = 1,000,000 Liters

### Cubic Kilometer (km3)

A Cubic Kilometer (abbreviated km3) is a cube that is 1 kilometer on each side. It is very large!

It is equal to 1,000,000,000 cubic meters (1 billion m3) or 1,000,000,000,000 liters (1 trillion L).

Useful for measuring large lakes, seas and oceans.

Lake Baikal, the largest continental lake in the world, contains 23,600 km3 of water.

The Pacific Ocean contains 700,000,000 km3 of water.

## More Examples

A liter (L) is:

• a bit more than a quart (US measure)
• about the quantity in a sports drink bottle
• very close to the volume of a kilogram of water

A millimeter (ml) is

• about the size of a grape
• a fifth of a teaspoon
• exactly one cubic centimeter (1 cc)

Activity: Discover Capacity