SI to Space:Time Units

All physical quantities reduce to relations in units of space and time (motion)

https://web.archive.org/web/20210829095845if_/http://blazelabs.com/pics/si-mod.gif

“ Yes, hard to believe but true! Even though such transitions are hard to implement and the inertia of the SI system of units is huge, a few transitions towards better definitions are successfully finding their way into the present SI metric system, so all is not lost. One such idea is the transition towards definitions based solely on the unit of time, taking the atomic clock second as reference and adopted exact values of certain constants. 

“ A notable step was taken in 1983 when the meter was defined by specifying that the standard speed of light be exactly 299792458 meters per second. 

“ In 1990 the BIPM established its voltage standard by specifying that Josephson's constant be exactly 483597.9 billion cycles per second per volt. Although this standard is already in use the official definition for voltage has not yet been changed to be consistent with the method of measurement, leaving the voltage and related quantities in a state of patchwork. 

“ In 1999 the CGPM called for a redefinition of the kilogram along the lines of the 1990 standards, and the following year two leading members, Mohr and Taylor, supplied the following proposed redefinition: 

‘ The kilogram is the mass of a body “at rest” (sic, emphasis added) whose equivalent energy equals the energy of a collection of photons whose frequencies sum to 135639274×1042 Hz. ‘

“ Mohr and Taylor also suggested that the larger Planck's constant be made exactly equal to 2997924582/135639274 × 10-42 joule second. This value follows from their suggested definition of the kilogram. "

A few physical entities and their inverses grouped by dimensions of space and time

from: https://web.archive.org/web/20210828171835/http://blazelabs.com/f-u-suconv.asp