metric

(noun)

A metric, or distance function, is a function which defines a distance between elements of a set.

Related Terms

  • Minkowski space
  • general relativity

Examples of metric in the following topics:

  • The Relativistic Universe

    • Gravity is a geometrical effect in which a metric matrix plays a special role, and the motion of objects are altered by curved space.
    • A matrix that goes in between two vectors to give a length is called a metric.
    • In mathematics, a metric or distance function is a function which defines a distance between elements of a set.
    • A space-time with the $\eta$ metric is called Minkowski space and $\eta$ is the Minkowski metric.
    • An arbitrary metric matrix can be denoted as $g$, raising questions as to what space-times with different metrics represent.
  • Prefixes and Other Systems of Units

    • A metric prefix, or SI prefix, is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit.
    • Prefixes in varying multiples of 10 are a feature of all forms of the metric system, with many dating back to the system's introduction in the 1790s.
    • The SI Unit system, or the metric system, is used by the majority of countries in the world, and is the standard system agreed upon by scientists and mathematicians.
  • Converting Units

    • EASY Unit Conversion in the Metric System - This simple extra help video tutorial explains the metric system and how to make simple metric conversions.
  • Length

  • Time

  • Mass

  • Nuclear Fusion

    • In its core, the sun fuses 620 million metric tons of hydrogen each second.
  • Radiation from Food

    • Food irradiation is currently permitted by over 50 countries, and the volume of food treated is estimated to exceed 500,000 metric tons annually worldwide.
  • Length

    • The metric length of one kilometre is equivalent to the imperial measurement of 0.62137 miles.
  • Four-Vectors

    • This tensor $\eta_{\mu\nu}$ defines the metric for flat spacetime.
    • It is called the metric because you need it to convert various four vectors (and other objects tensors) into scalars that we can measure.
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