What is the weight of 1 ounce (avoir) in grams?

The weight of 1 ounce (avoirdupois) is correctly confirmed as 28.350 grams. The ounce is a unit commonly used in the United States for measuring weight, especially in food and ingredients. The avoirdupois ounce is specifically defined within the avoirdupois system, which is used in most countries that employ traditional imperial measurements.

Understanding the conversion between ounces and grams is essential, especially in contexts like cooking, nutrition, and scientific measurements, where precision is important. The metric system, which uses grams, is often more widely adopted for scientific calculations and international trade, making these conversions particularly relevant.

The other options reflect common values but misrepresent the precise weight of an avoirdupois ounce. For instance, 31.103 grams aligns with the weight of a troy ounce, commonly used for precious metals, while the other choices are either rounded or pertain to different measurements, such as fluid ounces or variations in the imperial system. Hence, the significance of the correct conversion reinforces the importance of precision and clarity in unit measurements.