[Music] first immerse the bubble potometer into water and let it be filled with water make sure that no air bubbles are trapped inside the potometer then cut a leafy chute from a plant and fit it tightly into the bubble potometer under water take the potometer out of water and immediately close the tap of the reservoir place a beaker of water at the end of the capillary tube [Music] smear all the junctions with vaseline to prevent leakage [Music] dry the leafy shoot with tissue paper and wait for about five minutes for the leafy chute to equilibrate [Music] introduce an air bubble into the capillary tube this can be done by lifting the end of the tube out of water for a while and then putting it back into water wait for the air bubble to move into the graduated part of the capillary tube record the initial position of the air bubble after a specific period of time for example 15 minutes record the final position [Music] after that open the tap of the reservoir to send the air bubble back to the right hand side of the capillary tube to reset the potometer repeat the measurement process to get two more readings [Music] finally calculate the distance traveled by the air bubble and the rate of movement of the air bubble