Qian (mass)
Qian (simplified Chinese: 钱; traditional Chinese: 錢; pinyin: qián), called tsin (cin4) in Cantonese, tiền or đồng in Vietnamese, or "Chinese ounce" or "mace" in English, is a traditional Chinese unit for weight measurement. It originated in China before being introduced to neighboring countries in East Asia. Nowaday, the mass of 1 qian equals 5 grams in mainland China, 3.75 grams in Taiwan, 3.7799 grams in Hong Kong, Singapore and Malaysia, and 3.78 grams in Vietnam.
Qian is mostly used in the traditional markets, and famous for measuring gold, silver and Chinese medicines.