At roulette, the odds are constant, and past outcomes have no effect on future play. On a double-zero wheel, the chances of any given number showing up are 1 in 38, every time, no matter what has gone before.

THE PHYSICS OF ROULETTE. Our understanding of the physics behind the movement of the ball and wheel is pretty solid  governed by Newton's laws of motion. As the ball slows, gravity takes hold and it falls into one of the numbered compartments. It is predictable when the ball will leave the rim.