Newtonian gravity (classical mechanics). Two-body gravitational attraction is observed to be an inverse square power law; gravitational attraction decreases wi

Newtonian gravity (classical mechanics). Two-body gravitational attraction is observed to be an inverse square power law; gravitational attraction decreases with the square of the distance. g, the gravitational constant of Earth, is observed to be exponential; 9.8 m/s^2. Atmospheric pressure: https://en.wikipedia.org/wiki/Atmospheric_pressure#:~:text=Pressure%20(P)%2C%20mass%20(,atmospheric%20mass%20above%20that%20location. https://en.wikipedia.org/wiki/Atmospheric_pressure#:~:text=P... : > Pressure (P), mass (m), and acceleration due to gravity (g) are related by P = F/A = (m*g)/A, where A is the surface area. Atmospheric pressure is thus proportional to the weight per unit area of the atmospheric mass above that location.