214) The elements are made up of minute and chemically invisible particles as atoms.

215) All perfect gases change in volume by 1 / 273th of its original volume at 0 Degree Centigrade for every 1 Degree Centigrade change in temperature, when the pressure remains constant. This statement is called

216) A good fuel should have __________ ignition point.

217) According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.

218) The amount of heat generated per kg of fuel is known as