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The chi is a traditional Chinese unit of length. Although it is often translated as the "", its length was originally derived from the length of the human forearm,〔Shuowen Jiezi, "尺，十寸也，人手却十分动脉为寸口。十寸为尺，所以指斥规矩事也。" 〕 similar to the ancient cubit. It first appeared during China's Shang dynasty approximately 3000 years ago and has since been adopted by other East Asian cultures such as Japan, Korea, and Vietnam. Its present value is standardized around a third of a meter, although the exact standards vary among the mainland of the People's Republic of China, its special administrative region of Hong Kong, and Taiwan. In its ancient and modern forms, the chi is divided into 10 smaller units known as cun (the "Chinese inch") and 10 chi together form one zhang. ==Modern values== In People's Republic of China ''chi'' has been defined since 1984 as exactly 1/3 of a meter, i.e., 33 cm (approximately 1.094 ft). However, in the Hong Kong SAR the corresponding unit, pronounced ''chek'' in Cantonese, is defined as exactly 0.371475 m (exactly 14 in).〔Government of Hong Kong, (Weights and Measures Ordinance ) of 1997〕〔(WEIGHTS AND MEASURES ORDER – SCHEDULE ) (Hong Kong Regulations)〕 The two units are sometimes referred to in English as "Chinese foot" and "Hong Kong foot". In Taiwan, ''chi'' is the same as the Japanese ''shaku'', i.e., 10/33 of a meter (30.303 cm). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chi (unit)」の詳細全文を読む スポンサード リンク
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