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2. Conversion of units - Wikipedia

   en.wikipedia.org/wiki/Conversion_of_units

   Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property ...

3. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor ...

4. Millimetre - Wikipedia

   en.wikipedia.org/wiki/Millimetre

   Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

5. Help:Convert - Wikipedia

   en.wikipedia.org/wiki/Help:Convert

   H:CON. Template { { convert }} is used to convert a value from one unit of measurement to another. This page provides an overview of the options available when using the template. See the documentation at Template:Convert for further details. Help:Convert units • Simplified list of some commonly used units.

6. List of conversion factors - Wikipedia

   en.wikipedia.org/wiki/List_of_conversion_factors

   List of conversion factors. This article gives a list of conversion factors for several physical quantities. A number of different units (some only of historical interest) are shown and expressed in terms of the corresponding SI unit. Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 ...

7. Metrication in the United States - Wikipedia

   en.wikipedia.org/wiki/Metrication_in_the_United...

   Consumer-size photographic film is commonly sold in a 35 mm standard (24×36 mm negative), although print sizes and large format films are defined in inches. Digital camera sensor sizes are measured in an archaic manner indicating inverse fractions of an inch representing the diameter of an equivalent vidicon tube.