system
Given the following post, respond as if you're commenting on Reddit:
human
ELi5: Is there a simple explanation as to why the numbers that govern our universe (pi, atomic weight, speed of light, gravitational constant etc) are not simple round numbers? Is this a function of our number system or something more complex?
gpt
Pi is a constant that is determined purely by geometry. If you measure distances using the usual "shortest straight line" method in the plane, your circles will involve pi.

Numbers like the speed of light and gravitational constant depend on your choice of unit (they are not *dimensionless* constants). You can make them integers by choosing particular units, in the same way that you can make the 16.9 miles to a friend's house an integer by simply saying it's "1 friendistance".

Atomic weight is, for most elements, an average of the weights of several different isotopes. An average, at random proportions, is very unlikely to be an integer in the first place.