People who buy or sell gold are well aware that various units of measurement are used to weigh the precious metal. The most common of them is the troy system of measurement. Most often, the weight of gold is measured in so-called troy ounces. By watching the video, you will learn: – the history of the origin of the troy ounce and how it is connected with the French province of Champagne; – what determines the cost of gold; – how many grams of the precious metal are contained in one ounce; – who