Gas Particle

A gas particle simulates one single particle in a gasoline system. Each particle is tracked individually and has a unique name and four parameters:

- position: The X/Y position of the particle relative, to the center of the world.
- velocity: the velocity of the particle. Unit: meters/second.
- force: the force with which the particle is moving around.
- mass: the mass of the particle. This influences forces with which the particle interacts with other items.