what weighs 1 ounce
It's both. An ounce is either 1/8 of a cup, or 1/16 of a pound. That's fluid ounces. For nutrition labeling purposes, a teaspoon means 5 milliliters (mL), a tablespoon means 15 mL, a cup means 240 mL, 1 fl oz means 30 mL, and 1 oz in weight means 28 g.