What does the First Law of Thermodynamics state?

The First Law of Thermodynamics is a fundamental principle that states energy can neither be created nor destroyed. This means that the total amount of energy in an isolated system remains constant over time. Whenever energy seems to be lost or gained, it is actually transformed from one form to another, such as from potential energy to kinetic energy or from thermal energy to mechanical energy.

This law is crucial in all fields of science, particularly in physics and engineering, to understand energy conservation and transfer processes. It lays the foundation for studying how energy moves within systems, such as in engines, natural ecosystems, and even human bodies.

Understanding this concept helps clarify misconceptions about energy being "used up" or "wasted," as any energy accounted for is simply converted to a different form rather than disappearing altogether.