How many grams are there in one ounce (oz)?

An ounce (oz) is a unit of mass commonly used in the Imperial system and the United States customary system. On the other hand, the gram (g) is a unit of mass in the metric system (SI units). Converting between these two units is important in science, trade, and daily life, especially when measuring food, chemicals, or precious metals.

One ounce (oz) is equal to approximately 28 grams. To be more precise, 1 ounce = 28.3495 grams, but in most everyday calculations and scientific multiple-choice questions, this is rounded to 28 grams for simplicity.

The conversion between ounces and grams is based on standard definitions of mass. The ounce is historically linked to the pound, with 1 pound = 16 ounces. Since a pound equals 453.592 grams, dividing this by 16 gives the value of one ounce in grams, which is close to 28.35 grams.

This conversion is especially important in chemistry and laboratory work, where exact amounts of substances must be measured. For example, when preparing chemical solutions, ingredients are often listed in grams, while certain older references or instructions may list weights in ounces. Understanding conversions ensures accuracy and prevents errors in experiments.

Outside the lab, grams and ounces are widely used in cooking, nutrition, and health sciences. Recipes often use ounces in countries like the USA, while grams are standard in most other parts of the world. Jewelers also rely on the ounce-to-gram conversion when weighing precious metals like gold and silver, where accuracy is crucial.

In short, the correct answer is 28 grams. Remembering this basic conversion helps in both academic studies and practical everyday science, making it a fundamental fact for students and professionals alike.