50g is 0.1 catties.

1kg=1000g, 1kg=2kg, then 1kg=0.5kg=500g. Therefore, it can be calculated by division, that is, 50/500=0.1kg. The units of weight are tons, kilograms, grams, milligrams and kilograms. Jin is a unique unit of weight measurement in China. 1 ton = 1000 kilograms, 1 kilogram = 1000 grams, 1 kilogram = 2 pounds.

A gram is a mass unit used to express the mass of an object. Its unit symbol is g. When describing objects with smaller masses, grams are used as the unit. When describing larger objects, the unit kilogram is used. The commonly used units of mass in ascending order are grams, liang, catties, kilograms (kilograms), and tons.

The ancient units of measurement are introduced as follows:

1. Pre-Qin: In the Shang Dynasty, standard length units - inches and 咫s appeared.

2. In the late Shang Dynasty, there were a certain number of length units, such as: ruler (10 inches), liang (10 pinches, or 6 grids and 3 pinches), zheng (2 liang, that is, 20 pinches) , or 13 grids and 3 pinches), Zai (matching two or two is "positive", that is, a whole is 2 positive), PI (positive is divided into one half, that is, less than two), PI (2 or 3 pieces, that is, not two) Up to 2 taels or 3 taels), Guan (two taels are positive, that is, 4 pieces), and silk (two taels are positive, that is, less than 4 pieces).

3. Qin Dynasty: There were certain conversion relationships for length, area, volume, and weight.

4. Han Dynasty: Weight units began to be set, including Jun, Shi, Dou, Jin, etc. The Han Dynasty made it clear the importance of weights and measures to commerce.