# Speed of light

The speed of light is a 1:1 relationship between a natural unit of length and time. In fact, the speed of light defines time potential as the shortest interval of change in the position of an elementary particle.

The speed of light is an intensive property representing the maximum rate of change in unit dimensions of length and time.

Because the speed of light is a rate, it can be expressed using different quantities of length and time, provided numerator and denominator are the same in natural units. SI units of length and time do not align as nicely, but the ratio of Planck length to Planck time has a precise definition of 299,792,458 units of length per unit of time.

The New Foundations Model represents the speed of light using length and time potential and designating each unit dimension as a change in length and time respectively. The maximum velocity potential–the speed of light–is represented by a single vertical line across both unit dimensions. A decrease in velocity potential is shown as a larger decrease in time potential relative to length potential.

Selecting a particle’s wavelength as the change in position gives its oscillation period in the time dimension.

Speed of light