If you want to measure the capacity of very large
containers like tubs or pools, use a gallon.

If you want to measure to the capacity of large containers such as milk, juice, or soda, use a quart.

If you want to measure the capacity of small
containers holding milk or juice, use a pint.

If you want to measure the capacity of a very small
container (like a glass) that will serve just one person,
use a cup.
 

        10 gallons                        100 gallons                50 gallons

     1  1/2 pints                        1 pint                        1 pint

 Gallons, quarts, pints, and cups
are used to measure capacity.