@@ -1,5 +1,7 @@
# See https://en.wikipedia.org/wiki/Stoney_units
+use physics::constants
+
unit l_s: Length = sqrt(gravitational_constant × electron_charge^2 / 4 π ε0 speed_of_light^4)
unit m_s: Mass = sqrt(electron_charge^2 / 4 π ε0 gravitational_constant)
David Peter