How to say r ?



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What is the definition of r ?

  1. the 18th letter of the Roman alphabet
  2. the length of a line segment between the center and circumference of a circle or sphere
  3. (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
  4. a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air

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