Thermodynamics is concerned with the conversion ofheat into mechanical energy or vice versa.
Heat usually generated through combustion of fossil fuelor nuclear reaction.
Examples:-Heat to Mechanical Energy
Petrol, Diesel engines - cars, trucks, boats, trains.
Steam turbines - electricity power generation, ships.
Gas turbines - ships, electric power generation, aircraft.
Mechanical Energy to Heat
Stored chemical Energy to Heat
Phase changes in metals