Hello... I have heard that the speed of light is 300,000km/s. Planks constant is another number and so on and so on and so on. Alot of these numbers seem to be very 'arbitrary' figures.... Is there a subject in physics called "parameter" analysis where the various arbitrary numbers and constants in physics are studied to give some understanding or reason for their magnitude? Also, is there another area in physics that provides principled or theoretical or a logical foundation for the various terms in physics like ...m/s, kg/m/s etc.etc.etc. that were introduced in physics to formulate various theory's. Sorry.. a bit of a vague question. * In the equation P=mv (which is the equation for momentum)...if I switch the variables around I get M=P/v....Does this equation mean that if there is a change in momentum there is a "direct - and exactly porportional change in velocity? Eg. If P= 5m/s v will equal 5m/s? Thank you for any and all answers. Bye G.