EVERYDAY SCIENCE

Detailed explanation-1: -Helium was detected by Janssen and Lockyer independently in the spectrum of the sun in the year 1868. Later in 1885 it was found on the earth by Ramsay.

Detailed explanation-2: -Discovery of noble gases Using two different methods to remove all known gases from air, Ramsay and Rayleigh were able to announce in 1894 that they had found a monatomic, chemically inert gaseous element that constituted nearly 1 percent of the atmosphere; they named it argon.

Detailed explanation-3: -The Sui gas field in northeast Baluchistan was discovered by a test well completed by Pakistan Petroleum Limited in 1952. After the drilling of five more wells on the large exposed dome, the reserves of recoverable natural gas were estimated to be 4–5 million million cubic feet.