How to compare and contrast the simple pendulum swinging in air vacuum and water.i had the graph already only?

All of them would swing back and forth in a decaying oscillation, uming that the water resistace is low enough to permit the pendulum to oscillate at all. The oscillations in vacuum and in air would be much the same, with almost the same period of oscillation and with the air damping the oscillations only marginally more than the volume. The buoyant force of the air will serve to slow down the period of the pendulum slightly but the change will be noticeable in a clock. The buoyant force of the water will slow the pendulum down noticeably, on the order of several percent with a metallic pendulum bob. The damping will also slow the period of free oscillation very slightly for the pendulum swinging in air, somewhat more for the pendulum in water. Nevertheless, the effect of the buoyant force would predominate in changing the pendulum's period.