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  2. Tape measure - Wikipedia

    en.wikipedia.org/wiki/Tape_measure

    Class II: accurate to ±2.30mm over 10m length; Class III: accurate to ±4.60mm over 10m length; If a tape measure has been certified then the class rating is printed onto the tape alongside other symbols including the nominal length of the tape, the year of manufacture, the country of manufacture, and the name of the manufacturer. [33]

  3. Length - Wikipedia

    en.wikipedia.org/wiki/Length

    Length is a measure of distance. In the International System of Quantities , length is a quantity with dimension distance. In most systems of measurement a base unit for length is chosen, from which all other units are derived.

  4. Length measurement - Wikipedia

    en.wikipedia.org/wiki/Length_measurement

    Length measurement, distance measurement, or range measurement (ranging) all refer to the many ways in which length, distance, or range can be measured. The most commonly used approaches are the rulers, followed by transit-time methods and the interferometer methods based upon the speed of light .

  5. Unit of measurement - Wikipedia

    en.wikipedia.org/wiki/Unit_of_measurement

    A unit of measurement, or unit of measure, is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. [1] Any other quantity of that kind can be expressed as a multiple of the unit of measurement. [2] For example, a length is a physical quantity.

  6. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    The basic unit of length in the imperial and U.S. customary systems is the yard, defined as exactly 0.9144 m by international treaty in 1959. [2] [10] Common imperial units and U.S. customary units of length include: [11] thou or mil (1 ⁄ 1000 of an inch) inch (25.4 mm) foot (12 inches, 0.3048 m) yard (3 feet, 0.9144 m)

  7. List of physical quantities - Wikipedia

    en.wikipedia.org/wiki/List_of_physical_quantities

    Measure for how easily current flows through a material siemens (S = Ω −1) L −2 M −1 T 3 I 2: scalar Electrical conductivity: σ: Measure of a material's ability to conduct an electric current S/m L −3 M −1 T 3 I 2: scalar Electric potential: φ: Energy required to move a unit charge through an electric field from a reference point ...

  8. Measurement - Wikipedia

    en.wikipedia.org/wiki/Measurement

    The use of the word measure, in the sense of a measuring instrument, only survives in the phrase tape measure, an instrument that can be used to measure but cannot be used to draw straight lines. As can be seen in the photographs on this page, a two-metre carpenter's rule can be folded down to a length of only 20 centimetres, to easily fit in a ...

  9. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    The length of the equator is close to 40 000 000 m ... List of metric units – Class of units of measurement; Metrology – Science of measurement and its application;

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