How do the laws of thermodynamics apply to James Watt's steam engine?

James Watt's steam engine exemplifies the laws of thermodynamics, particularly the first and second laws. The first law, which states that energy cannot be created or destroyed, is demonstrated as the engine converts heat energy from steam into mechanical work. The second law highlights the concept of entropy, as the engine's efficiency is limited by the irreversibility of energy transformations and the necessity of heat loss to the environment, which prevents 100% conversion of heat into work. Thus, Watt's innovations improved efficiency while adhering to these fundamental principles.