Examples of items weighing an ounce include a slice of bread, about five quarters, approximately three and a half French fries and a matchbox-sized cube of cheese. Objects that weigh an ounce are fairly light, weighing in at just one-sixteenth of a pound.
The term ounce may be used to describe both weight, which is also called mass, or volume. When used to describe volume, the term fluid ounce is often used. A fluid ounce is equal to one-eighth of a cup. These terms are both used to describe food portions, so it's very important to pay attention to which measurement is being used.