During the Republic of China, Hong Kong used the hexadecimal system of 1 kg = 16, but don't mistake it for Hong Kong's 1 kg = Mainland's 1 kg 6, which is a big mistake. 1 kg in Hongkong and 1 kg in Chinese mainland are the same. Hong Kong 1 kg is divided into 16, with two units; Mainland 1 gold is divided into 10 shares, and the unit is also two; In this case, mainland China's 1 kg = Hong Kong's 1 kg, mainland China's 1 kg = Hong Kong's 1.6 kg.