There are a number of ways to quantify if a system is chaotic or not.
The simplest is the Lyapunov exponent. The Lyapunov exponent is a local (in phase space) quantity which describes the growth in (phase space) distance between nearby trajectories. If the exponent is greater than zero, the... (more)
Below is the video for Belousov–Zhabotinsky reaction, also known as chemical oscillator. It might seem like that some kind of energy is being passed on, and all transfers of energy comes into the domain of classical thermodynamics, where parameters like pressure,temperature and volume changes ver... (more)