1) what is Chemistry?
2) what is Physics?

1) what is Chemistry?

With respect to physics, understanding it in very abstract level upto what the state and it's reaction can be captured in proper metrics, which helps to understand kind of reaction in all physical existence. Applicability of physical properties/principles of the reaction could be much complicated, may not be measured at all, sometimes, but its implied logic is very formal across; under a given well defined physical circumstance.

2) what is Physics?

Physics is the way of understanding the "natural existence of phenomena" and it's properties/principles, and also understanding its applicability (in a measurable way).

NOTE: In physics, type and size are highly matters. When it changes the applicable/applied formula also changes, doesn't matter how tiny or how big it is.

Physical Constants

There are lot of physical constants which we use in physics in general for calculation. Even those are depend on size, means phenomenal size and the basic formation and the whole size. For example earth is almost a sphere and its constitute of Atoms that is the phenomena. The gravity g is derived by using both in consideration. And it is constant because of the nature of mathematics. Refer the knols.

1) http://knol.google.com/k/anand-sadasivam/three-random-points-triangle-circle/14aqr8lbuwpu8/12#
2) http://knol.google.com/k/anand-sadasivam/four-random-points-sphere/14aqr8lbuwpu8/13#

http://en.wikipedia.org/wiki/Conic_section