The present work, study the behavior of bubble of air in purified water, shows that in range of equivalent radii between 0.07 to 0.80 cm, the trajectory is not linear. Fours cameras, were used to obtain a theree dimensional visualization of the perpendiculary intersecting planes for this purpose. A geometrical model utilizing a Lagrangean type of reference is developed in order to analyze the phenomenon. This reference is translating parallely to the phenomenon. This reference is translating parallely to the straight line that best approximates the locus of points formed by the center of revolution of the bubble trajectory on a perpendicular plane that straight line is that of a series of practically perfect ellipses. The average values of the parameters a and b of the parameters a and b of these ellipses is determined as well as the angle that the trajectory makes with the vertical. It is found that theses average values a and b can be represented by an appoximately continuose curve as a fuction of bubble radius; whose maximum point is located at a Value of r between the range 0.07 to 0.80 cm. This verifies that the order of maximum point is larger than the deviation from the measured values. It is found that although the vertical component of velocity is constant one revolution to the next, the instantaneous velocity within each revolution vaies. The bubble shape and its fluctuation are also recordede here.