EXERCISE 6 

 IS AIR PRESSURE THE SAME IN ALL DIRECTIONS? 



Materials. Same as in Exercise 5. 



Directions. Using the same experiment as in Exercise 5, pump out part of the air and then close 

 the stopcock so that no air can enter. Turn the apparatus on its side, and also upside down. In each 

 case note whether the rubber is bulged inward in the same way and to the same extent. What is 

 your conclusion ? 



Additional problems. Why does not the downward pressure of the air force a bucket or other object 

 from one's hand? 



What causes a rubber or leather " sucker " to adhere to a smooth surface ? Will it adhere more readily 

 to a smooth or a rough surface ? Why ? 



[7] 



