266) One kg of sulphur requires 1 kg of oxygen for complete combustion and produces 2 kg of sulphur dioxide.

267) The change of entropy, when heat is absorbed by the gas, is

268) A machine which violates the first law of thermodynamics is known as perpetual motion machine of the second kind.

269) Both the Ericsson and Joule's cycle have two constant pressure processes.

270) The general law for the expansion or compression of gases, is