The amount of order in an isolated system cannot increase; it may only stay the same or decrease. This expresses which of the following?

Conservation of mass

The First Law of Thermodynamics

The second Law of Thermodynamics

Kinetic Theory

The definition of work

the definition of heat

Second law of thermodynamics.

Explanation:

Second law of thermodynamics states the entropy or order in an isolated system always increases. The isolated system evolve spontaneously toward thermal thermal equilibrium.

For example if a room is untidy and dirty, it will become messy over time and disorder. So when the room is cleaned, there won't be disorderliness and entropy will decrease.