You will see volume amounts everywhere when you look for them. A gallon of gas or a gallon of milk. A 2 liter of soda. In fact, nearly every food item you buy will list the ounces it contains.

Here are some common units of volume in both metric and imperial systems, along with their conversions:

Metric System:

Milliliter (mL) - the volume of one cubic centimeter; 1 mL = 0.001 L
Liter (L) - the volume of a cube that measures 10 cm on each side; 1 L = 1000 mL

Imperial System:

Fluid Ounce (fl oz) - 1/128th of a US gallon; 1 fl oz = 0.0296 L
Cup - 8 ounces or 1/16th of a US gallon; 1 cup = 0.2366 L
Pint - 1/8th of a US gallon; 1 pint = 0.4732 L
Quart - 1/4th of a US gallon; 1 quart = 0.9464 L
Gallon - 128 fluid ounces or 4 quarts; 1 gallon = 3.7854 L

It's important to note that while the metric system is based on multiples of ten, the imperial system is based on fractions of a gallon. This can make conversions between the two systems challenging, but there are many online calculators and conversion charts available to make it easier.

The most important conversion to keep in mind is the number of liters in a gallon. The easiest way to remember this is that if you poured 2 2-liter bottles of soda into a gallon milk jug, it would overflow a little, because there is less than, but close, to 4 liters in a gallon.