Conserved quantities

Conserved quantities are properties of a system that remain unchanged over time, regardless of how the system evolves. Examples include energy, momentum, and electric charge. Think of them as "invariants"—like a rule that certain values stay constant as processes occur. This concept helps scientists understand and predict the behavior of physical systems, from moving objects to subatomic particles, by knowing which properties don’t change even as the system transforms. Conservation laws are fundamental principles that underpin much of physics, providing a reliable framework for describing natural phenomena.