An ounce (abbreviated as oz) is a unit of weight measurement primarily used in the United States customary and British imperial systems. One avoirdupois ounce equals exactly 28.3495 grams and is one-sixteenth of a pound. There are 16 ounces in one pound, and one ton equals 32,000 ounces. The ounce is used to measure smaller weights like food portions or small objects. To summarize key points:

• 1 ounce = 28.3495 grams
• 1 ounce = 1/16 pound
• 16 ounces = 1 pound
• 1 ton = 32,000 ounces

Note: The fluid ounce, which measures volume, is different from the ounce used for weight.