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Learn about the origins and evolution of English units of measurement, from Anglo-Saxon and Roman influences to Imperial and US customary systems. Find out how the yard, foot, inch, pound, and other units were defined and changed over time.
Learn how to convert units of measurement using the factor–label method, a technique that cancels out dimensional units with fractions. Find out the limitations and applications of this method for different types of units and equations.
A Snellen chart is an eye chart that can be used to measure visual acuity by reading letters of different sizes. The chart is named after Herman Snellen, who developed it in 1862, and it is used to express vision as a fraction, such as 6/6 or 20/20.
An inch is a unit of length in the British Imperial and the United States customary systems of measurement, equal to 25.4 mm. The word inch comes from Latin uncia, meaning "one-twelfth", and is also used to translate similar units in other systems.
The U.S. customary system is a system of measurement units derived from English units and used in the U.S. and some territories. It is based on the inch, foot, yard, and mile for length, and the pound, ounce, and gallon for mass and volume.
English: a ruler from 0 to 1 inch (in.) in 1/32 inch divisions below the line and 1/2 millimetre (mm) divisions above the line to give a visual representation of the approximations. Principally designed to help visually determine if a metric or imperial drill bit will suffice.