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The interaction between two gears is a fundamental aspect of how gear revolutions are determined. When one gear turns, it affects the motion of another gear that it is meshed with. This interaction is dictated by both the number of teeth on each gear and their diameters. Each gear will rotate a certain number of times depending on the amount of engagement with the other gear, which directly influences the revolution count.

For instance, if one gear has more teeth than another, it will turn fewer times to maintain the same level of engagement with the other gear. This principle allows for gear ratios, which enable the transfer of torque and speed between gears. Therefore, understanding that revolutions depend on this interaction helps illustrate the mechanical relationships and fundamentals of gear systems. By recognizing that the interaction defines the rotational behavior between gears, one can apply this knowledge to practical situations in mechanical engineering and robotics.