Definition
Fluid ounce
A fluid ounce is a U.S. customary unit for measuring liquid volume.
Continue from this idea into connected AXIO math.
What it means
A fluid ounce tells how much space a liquid takes up, not how heavy it is. Picture a straight-sided measuring cup split into eight equal volume parts: each part is 1 fl oz, and all eight parts make 1 U.S. cup. Read the number and the unit together, as in 6 fl oz.
Remember it
Fluid means liquid: eight 1-fl-oz parts fill one U.S. measuring cup.
Example
A recipe needs 6 fl oz of juice. On an 8-fl-oz measuring cup, fill six of the eight equal ounce marks. That is 6 fl oz, or 3/4 of a U.S. cup.
Watch for
A fluid ounce measures liquid volume. An ounce (oz) without “fluid” usually measures weight or mass, so 8 fl oz is not the same statement as 8 oz.
Common mix-up
U.S. and Imperial fluid ounces are different sizes. This card owns the U.S. customary fluid ounce.
Exact meaning
A fluid ounce (fl oz) is a U.S. customary unit of liquid volume. Eight U.S. fluid ounces equal one U.S. measuring cup.