The positions of each and every object is recalculated based on the time increment. This is a variant of differentiation by incrementing time values in very small steps.
The total time for which the simulation is rendered is given by this duration.
The acceleration due to gravity is given by this value for the world. It acts in the -y direction.
The world can be filled with any kind of liquid or gas, which have their drag coefficient / viscocity given by this value. This is used with respect to Stoke's law.
The fluid within the world may have a flow. This velocity flow is given by the wind velocity which is defined in m / s.