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

272) A cycle consisting of two constant pressure and two isentropic processes is known as