Argon constitutes almost 1% of the atmosphere of the earth. Its name is derived from the Greek Argos meaning inert. This lack of reactivity resulted in it being discovered relatively late on: in 1894. The British chemists John Rayleigh and William Ramsay on the basis of Cavendish's experiment were able to determine the presence of argon, a noble gas, in air. As with Cavendish's experiment a bubble of gas was left over after removing oxygen and hydrogen from a sample of air. Using spectroscopy, Ramsay found that the lines of the gas were in new places, identifying it as a new element, which he termed argon.