1L= 1000mL, 500mL=0.5L, l is unit of volume, kg is the unit of mass, 1 kg =0.5 kg, if it is water, the density of water is 1g/ml, 1L is. 3L water =6 kg.

In 2004, the General Administration of Quality Supervision, Inspection and Quarantine and the State Administration for Industry and Commerce jointly issued the Measures for the Supervision and Administration of Weighing and Measurement of Retail Commodities, which made strict provisions on the error standard of weight measuring tools. Anything exceeding this standard can be considered as "short of two pounds" and should be punished by law.

For grain, vegetables, fruits or foods not higher than 6 yuan per kilogram, the allowable error range of electronic scales is the largest. When the weight of such foods is less than 1 kg, the error cannot exceed 20g.

Dried vegetables, mountain (sea) treasures or food with a price higher than 30 yuan per kilogram but not higher than RMB 0/00 per kilogram 1 kg, when the weight is less than1kg, the error shall not exceed 2g. If the price of food exceeds RMB 0/00 per kilogram/kloc, the error shall not exceed 1 gram if it does not exceed 500 grams.

Extended data:

Han-Tang system, one Hu = 10 bucket =100L = 1000 =2000. In the Song Dynasty, the system was reformed, and the weight unit stone was used as the capacity unit. One stone =2 hoops = 10 bucket, which is now abolished.

During the Qin and Han dynasties, one liter was about180 ~ 220 ml. During the Wei and Jin dynasties, it increased greatly, and in the Sui, Tang, Liao and Song dynasties, a liter was about 600 ~ 660 ml. It continued to grow in the Song and Yuan Dynasties, rising to about 1000 ml in the first day of the Ming Dynasty, and has also increased since then.

Baidu Encyclopedia-L (Volume Unit)

People's Network-Online sale of remote control electronic scales can increase weight by 1 liter of water 20 meters away, which can produce four results.