Ounce
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The ounce is any of several different units of mass, weight, or volume and is derived almost unchanged from the uncia, an Ancient Roman unit of measurement.
Droste's Instant Cocoa with a net weight of 8 ounces
Fluid ounce
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A fluid ounce is a unit of volume typically used for measuring liquids. The British Imperial, the United States customary, and the United States food labeling fluid ounce are the three that are still
Ounce
…The ounce-force is a measure of force (see below). The fluid ounce is a measure of volume. Historically, a variety of different ounces measuring mass or volume were used in different jurisdictions by different trades…
A baby bottle in both American and imperial fluid ounces