Generally, by finding the slope of line created when you measure the variables.
Finding G, the gravitational constant in F=G*(m*M)/r^2 involves measuring the gravitational Force created at different separations for a given mass.
You graph this, F on one axis, R on the other an you get a clear trend.
Find the “slope” of this value and that’s your proportionality.
What makes it special is that you keep getting the same number regardless of masses you use or separations. It’s found to be constant for all gravitational systems.
The units are defined by the way you calculated the slope. They tag along with the ‘rise’ and ‘run’ terms.
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