FactsWhen people talk about their height, they often refer to their height in feet and inches.The inch is part of the imperial system of units. The word inch comes from uncia, the Latin word for twelfth part.The English inch was originally defined as the length of three barleycorns. The international inch has been set at 1/12 ft or 2.54 cm.When you read a book about past events, remember that in different times and places an inch could mean a various length. The English inch varied from 2,5400438 cm to 2,5399931 cm. The Bavarian inch ranged from 2,43216 cm to 2,918592 cm. The Vidicon inch is 16,93 mm.The foot is also a measurement unit. According to the British Imperial system, the foot equals to twelve inches. It's just about the length of an average man's foot.As with the inch, the foot was used by many countries. And the length could vary. For example, the Chinese foot varied between 31.95 to 33.83 cm!