Pressure in the Deep-ocean: an experiment with a foam ball
Everything in the deep ocean is under great pressure. The pressure increases about one atmosphere for every 10 meters of water depth. In order to test this pressure, a student from EPM in collaboration with EMPC and ISE,USJ, dove an expanded polystyrene foam (EPF) uniform ball into deep-water using the Portuguese remotely operated vehicle (ROV), called Luso (EMEPC).
Decoration of the ball was made by the EPM student Pedro Gonçalves and Patricia Conceição was the geologist (EMEPC) aboard NRP GAGO COUTINHO who carried out the experiment. Patrícia placed the ball in a mesh bag attached to the ROV Luso that plunged into the deep-ocean, reaching a depth of several hundred meters.
After the dive was complete and the ROV back to the surface, the ball returned smaller and shrunken. This happened because when the foam ball descended into the ocean attached to the ROV, tiny air bubbles entrapped in the polystyrene structure were compressed, crushed and released, reducing the total volume of the material.
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