1. The Second Law of Thermodynamics
The entropy of an isolated system remains constant or increases
Entropy -
A measure of the disorder in a physical system
This law states that all processes within an isolated system occur in such a manner that increases the randomness of the system.
Examples - spray air freshener, drop food coloring in a glass of water

2. Consequences of the Second Law of Thermodynamics
Heat will never flow spontaneously from a cold body to a hot body.
You cannot construct an engine that does nothing but convert heat to useful work.
Every isolated system becomes more disordered over time.

3. Heat Engines A heat engine uses energy provided in the
form of heat to do work and then exhausts the
heat which cannot be used to do work.
Heat engines such as automobile engines operate
in a cyclic manner, adding energy in the form of
heat in one part of the cycle and using that energy
to do useful work in another part of the cycle.

4. Terms Adiabatic – no heat added or removed
Isothermal – no change in temperature
Isochoric – no change in volume
Isobaric – no change in pressure
Q = 0
U = 0
W = 0

5. spark plug
intake valve
exhaust valve
piston
intake stroke
compression stroke
power stroke
exhaust stroke