अर्थ : A unit of radiation exposure. The dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air.

अर्थ : (physics) the universal constant in the gas equation: pressure times volume = R times temperature. Equal to 8.3143 joules per kelvin per mole.

अर्थ : The 18th letter of the Roman alphabet.

अर्थ : The length of a line segment between the center and circumference of a circle or sphere.