| 释义 |
Noun: r aa(r)- The 18th letter of the Roman alphabet
- R - The length of a line segment between the centre and circumference of a circle or sphere
- radius
Noun: R aa(r)- (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
- gas constant, universal gas constant - A unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
- roentgen, röntgen
Derived forms: rs, Rs Type of: alphabetic character, constant, length, letter, letter of the alphabet, radioactivity unit Part of: diam, diameter, Latin alphabet, Roman alphabet Encyclopedia: R |