How long is 820mm

It is used to describe lengths that are relatively small, like the widths of pipes, cables or connectors. The well known terms 8mm, 16mm and 32mm describe common widths of motion picture films. To understand the approximate size of one millimeter, see this tiny red line:.

And this line should be approximately five millimeters long:. Therefore there are 36 inches in a yard. There are exactly 2. Borrowed from the Latin 'uncia' - the English word 'inch', the origination of the word came from the Old English word for 'ounce' which was related to the Roman phrase for "one twelfth". The inch is still a commonly used unit in the UK, USA and Canada - and is also still used in the production of electronic equipment, still very evident in the measuring of monitor and screen sizing.

Quick Rough Maths. To get the Inches, divide the number of Millimetres by The various lengths were due to parts of the human body historically being used as a basis for units of length such as the cubit, hand, span, digit, and many others, sometimes referred to as anthropic units.

This resulted in the measurement of a foot varying between mm and mm in the past compared to the current definition of While the United States is one of the few, if not only, countries in which the foot is still widely used, many countries used their own version of the foot prior to metrication, as evidenced by a fairly large list of obsolete feet measurements.

Current use: The foot is primarily used in the United States, Canada, and the United Kingdom for many everyday applications. In the US, feet and inches are commonly used to measure height, shorter distances, field length sometimes in the form of yards , etc.

Feet are also commonly used to measure altitude aviation as well as elevation such as that of a mountain. The international foot corresponds to human feet with shoe size 13 UK , 14 US male ,