Revolving 'drumhead' with manometer shows pressure in water tank.

Revolving 'drumhead' with manometer shows pressure in water tank. U-Tube manometer filled with colored water Pressure chamber with thin rubber sides. A pressure chamber with thin rubber sides is immersed in water. The chamber is rotated from horizontal to vertical while submerged at a constant depth. The pressure, as shown on the manometer, is equal in all directions. Turning knob at top causes the submerged chamber to rotate. NOTE: Once the demo is performed, do not leave the pressure chamber submerged. SURFACE TENSION AND CAPILLARY ACTION.