Metric Volume
These are the two most common measurements:

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 makes 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".

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". 
Milk, soda and other drinks are often sold in liters.
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!
Liter is abbreviated L (some people use lowercase l, but that looks too much like 1).
Another way of thinking about a liter is:
 A box that is 0.1 meters (10 cm) on each side,
 One square meter that is millimeter thick.
Other Volume Measurements
You may come across these other volume measurements:
Cubic Meter (m^{3})
Volume is length by length by length, so the basic unit of volume is a cube that is 1 meter on each side.
The Unit is written m^{3} (cubic meters).
So, a cube that is 1 meter on each side is a cubic meter (m^{3}) ...
... and that is also equal to 1,000 liters.
1 m^{3} = 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 lakes and dams.
Cubic Centimeter (cc)
A Cubic Centimeter (abbreviated cc or cm^{3}) is a cube that is 1 centimeter on each side.
It is onethousandth of a liter, and onemillionth of a cubic meter. Or to put it another way:
1 m^{3} = 1,000 L = 1,000,000 cm^{3} (one cubic meter = a thousand liters = a million cubic centimeters)
More Examples
A liter (L) is:
 a bit more than a quart (US measure)
 about the quantity in a sports drink bottle
 close to the volume of a kilogram of water
A cubic centimeter is about:
