Amplitude's the magnitude of change in the oscillating variable, with each oscillation, within an oscillating system. For instance, sound waves are oscillations in atmospheric pressure and their amplitudes are proportional to the change in pressure during one oscillation. If the variable undergoes regular oscillations, and a graph of the system's drawn with the oscillating variable as the vertical axis and time as the horizontal axis, the amplitude's visually represented by the vertical distanc… (More on Amplitude)