omg "notes" are translated into heat this is so cool i think
The law of conservation of energy, first formulated in the nineteenth century, is a law of physics. It states that the total amount of energy in anisolated system remains constant over time. The total energy is said to beconserved over time. For an isolated system, this law means energy is localized and can change its location within the system, and it can change form within the system, for instance, chemical energy can become kinetic energy but it can be neither created nor destroyed. Furthermore, two initially isolated systems, that have no external or mutual interaction, can be logically composed into a single isolated system, and then the total amount of energy of the composite system is equal to the sum of the respective total amounts of energy of the two component systems. In this sense, the energy of a system is said to be additive. Likewise, for a homogeneous system in its own internal thermodynamic equilibrium, the internal energy is said to be anextensive quantity.[2][3][4][5]