Final answer:
Conservation in the law of conservation of energy means that the total energy in an isolated system remains constant, although energy can change forms.
Step-by-step explanation:
The law of conservation of energy is a fundamental concept in physics that deals with the total amount of energy in an isolated system. Conservation, in this context, means that the total energy in a closed or isolated system remains constant over time. This does not mean that energy cannot change forms; indeed, energy can be transformed from one type to another, such as from potential energy to kinetic energy (the energy of motion). However, while it can be transferred or converted, energy is neither created nor destroyed, according to this law. Importantly, this principle applies to all chemical and physical processes.