Was ist Entropie? Ein Maß dafür, wie wenig wir wirklich wissen.

Its the unavailability of a systems thermal energy for conversion into mechanical work.

An example would be a internal combustion engine. Itll always dump some waste heat into the envrionment, and can never be 100% efficient. Some of the energy produced will always go somewhere else that isnt useful for the task at hand.

Basically, you put something hot in a cold envrionment, and the thermal energy from the hot object will spread out until it and the envrionment are the same level of energy. Take this idea and run it to end of time, and you find that this eventually happens to the whole universe, aka Heat Death.