How big is a dollar coin?

The diameters of one-dollar coins are 30mm, 25mm and 22.25mm..

Since 1980, China has issued three versions of one-dollar coins, with the front patterns of the Great Wall, peony flowers and chrysanthemums. The Great Wall is 30mm in diameter, the peony is 25mm in diameter, and the chrysanthemum is divided into two specifications, the 2000 version is 25mm in diameter and the 20 19 version is 22.25mm in diameter.

Advantages of coins

First, the circulation life is much longer than that of paper money. The 1 standard machine-made currency manufactured under modern technology conditions can be circulated for 30,000 times, with an average circulation time of 30 years, while 1 paper money can be circulated for 300 times on average, which is only1100 of the life of coins. The ratio of the 20-year comprehensive cost of coins and banknotes with the same denomination 1 yuan is about 1: 15.

In addition, the introduction of 1 yuan coin is conducive to the popularization and application of vending machines, parking lot automatic toll collectors, subway and bus automatic ticket vending machines, which greatly facilitates people's lives.

Secondly, it is conducive to purifying the cash circulation environment and reducing the spread of germs. Many diseases are spread by paper money, and coins are much better than paper money. Coins can be selected, cleaned and disinfected by various measures, and then put back into the market; On the other hand, it is beneficial to prevent criminals from using small denomination banknotes to spread reactionary remarks and purify the circulation environment.

Coins also help to save natural resources. It protects the wood, cotton, fresh water and other resources needed to make paper money. In addition, this metal can still be recycled and recast after decades, and its original value will not be lost too much.