> Then the speed becomes dimensionless, length and time have the same unit and dimension Uh, that is not what the article you linked is saying. Natural units d

> Then the speed becomes dimensionless, length and time have the same unit and dimension Uh, that is not what the article you linked is saying. Natural units don’t make speed dimensionless, nor allow you to use the same unit for length and time. Natural units remove the conversion constants, not the units or dimensions.