United States customary units mass: tower, apothecaries', troy, avoirdupois, and metric. Of these, the avoirdupois weight is the most common system used in the U.S., although Troy weight is still used to weigh precious metals. Apothecaries weight—once used by pharmacies—has been largely replaced by metric measurements. Tower weight fell out of use in England (due to legal prohibition in 1527) centuries ago, and was never used in the U.S. The imperial system, which is still used for some measures in the United Kingdom and other Commonwealth countries, is based on avoirdupois, with variations from U.S. customary units larger than a pound. The pound avoirdupois,
Economic reforms under Peter the Great small copper coins. The silver coins were quite large and were often cut into several parts, each part having its own turnover. As part of the monetary reform in the year 1704, a new, simple decimal system was introduced. Instead of the weight, each coin was valued by its decimal number. Eventually, Europe also started using this system, but it was much later. Minting of coins became the unconditional monopoly of the state. There were also gold coins, but they were mostly used for ceremonial purposes, as a reward to the soldiers. The ban on export of precious metals was