The First Law of Thermodynamics: Energy Cannot Be Created or Destroyed

The First Law says energy can change forms, but the total amount always stays the same.
Burning fuel turns chemical energy into heat and motion—nothing is lost, just transformed.
A roller coaster converts potential energy at the top into kinetic energy as it speeds down.
Your body follows this law too—food energy becomes movement, heat, or stored fat.
Power plants don’t “make” energy; they only convert it from coal, wind, or sunlight.
Heat added to a system either raises its temperature or does work—never disappears.
Perpetual motion machines of the first kind are impossible because they break this law.
The First Law is a restatement of energy conservation in the language of thermodynamics.
Even in the vast universe, energy is never created from nothing or lost to nowhere.
Every car engine, fridge, and rocket follows this rule—it’s the heartbeat of all technology.