Philosophy of Physical Magnitudes - Paperbackby Niels C. M. Martens (Author) Dimensional quantities such as length, mass and charge, i. e., numbers combined with a conventional unit, are essential components of theories in the sciences, especially physics, chemistry and biology. Do they represent a world with absolute physical magnitudes, or are they merely magnitude ratios in disguise? Would we notice a difference if all the distances or charges in the world suddenly doubled? These central