Number of basic physical quantities

[Fe-56]

Recently, I was thinking about this:

Am I right if I say that there are only 4 (and exactly 4) basic physical quantities which are enough to explain all observed phenomena in nature?
(of course I mean HOW, not why)
(for example length, time, mass and electric charge or current)


(Because the SI table for example would explain how natural phenomana work and there are 7 basic quantities in it, but luminous intensity is just human subjective perception of light energies, mole is just a natural number and temperature is just something artificial talking about velocity of particles.)


thanks

 

[ncarron]

The number of basic "physical quantities" is arbitrary, and depends on your overall choice of units.
It is explained, in the context of Units Systems in Electromagnetism, at
http://arxiv.org/abs/1506.01951
This entire article may contain more than you're looking for, but your question will likely be answered in the course of your reading it.
- Neal