Why is it customary in the north to use the kilogram as a unit of mass, while the south use jin?

Ton (t=ton), kilogram (kg=kilogram), gram (g=gram) is the international unit (common throughout the world)

Kilogram, city catty is the common unit of weight in China.

Municipal catty abbreviation jin, is China's traditional unit of measurement.

China's north and south are in folk use jin, while the kilogram is required by national legislation.

Kilogram

is a metric unit, the international metric system is a system of measurement, founded in France, in 1875, representatives of seventeen countries in Paris, France, a meeting set as the international common system of measurement. The main unit of length is the meter, a meter is equal to one forty millionth of the meridian of Paris. Standard meter scale made of platinum-iridium alloy, section for the X-shaped, at 0 ℃ when the standard meter scale on both ends of the line engraved between the distance for one meter. The main unit of mass is the kilogram, the standard kilogram of weight is made of platinum-iridium alloy cylinder, in latitude 45 ° sea level weight is one kilogram. The primary unit of volume is the liter; one liter equals the volume of one kilogram of pure water at 4°C (maximum density) at standard atmospheric pressure. Also called the metric system; abbreviated metric.

Jin

It is the unit of China's municipal system, which is a transitional system that the Republic of China government adapted from traditional Chinese weights and measures in order to fully switch to the metric system in the 1920s. The municipal system was standardized in 1929 and converted well to the 10-position metric system. In ancient times, units were mostly hexadecimal. Part of the municipal system is still used in modern China. However, according to the People's Republic of China (PRC) State Council issued in May 1977 "Regulations on the Administration of Weights and Measures of the People's Republic of China (PRC)

(for trial implementation)", the "municipal system" of measurement was gradually phased out of use on the mainland, and the units of measurement that are popular in the private sector today are: "mu" for area, "ft" and "shaku" for length, "shaku" and "shaku" for length, and "shaku" and "shaku" for length. The "feet" and "inches", the weight of the "catty" and "two", other units of measurement are rarely used.

In order to unify the measurement of our country, the State Council instructed from January 1979, the national Chinese medicine prescription unit of measurement are used to "grams" as the unit of metric system. Specifically: "Chinese medicine unit of measurement of conversion, according to ten two for a catty of the city system of a penny is equal to 5 grams; sixteen two for a catty of the city system of a penny is equal to 3 grams, the end does not count."

Part of the knowledge about measurement, pharmacy management and regulations in the rarely assessed, it is recommended that you understand the relevant knowledge can be.

Metric grams is a metric unit, referred to as grams, 1 kilogram = 1,000 grams = 2 pounds, this is the decimal system, China's municipal units have followed the ancient 16 rounds, that is, 1 catty = 16 two.

In short, 1 catty = 500 grams, 1 kilogram = 1000 grams, keeping in mind that this conversion can be.