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

271) The heat energy stored in the gas and used for raising the temperature of the gas is known as