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Working on Hetric, a hexadecimal metric system Similarly to SI, Hetric has seven base dimensions and, therefore, seven base units: time in ticks (t), length in spans (sp), mass in gravs (gv), temperature in therms (th), current in unes (U), angle in zawia (zw), and luminous intensity in lee (Le).

The span, the base unit of length, is defined such that the speed of light in a vacuum, c, is 16^7 sp/t exactly, making 1 sp ≈ 0.5217960915 m. The grav, the base unit of mass, is defined such that the Planck constant h = 16^-25 gv⋅sp^2/t, making 1 gv ≈ 1.441364926 g.

The therm, the base unit of termperature, is defined such that the Boltzmann constant k = 16^-17 gv⋅sp^2 / t^2⋅th, making 1 th ≈ 2.266665264 K. The une, the base unit of electric current, is defined such that the elementary charge e = 16^-15 kf (1 kifi = U⋅t), making 1 U ≈ 0.3953576405 A.

The zawia, the base unit of angle, has the exact same definition as the radian but is treated as a base dimension instead of some dimensionless unit, meaning 1 zw = 1 rad by definition. The lee, the base unit of luminous intensity, is still being defined :3