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The materials required for this science fair project:

-    A swimming pool at least 1.5meter deep

-    A Speedo Fastskin swimsuit

-    An Aquapel Hydrasuit swimsuit

-    A normal polyester swimsuit.

-    30 kg of sand

-    An airtight container large enough to fill the 30kg of sand

-    A measuring tape

-    A stopwatch

-    1 roll of masking tape

-    A qualified swimmer as assistant


1.    For this experiment, the independent variable is the type of swimsuit used. The dependent variable is the time for the test object (container filled with sand) to reach the pool bottom. This is determined by measuring the time using a stop watch. The constants (control variables) are the weight and dimension of the container, the amount of soil and the depth of the pool.

2.    The swimming pool is surveyed and a suitable location is selected where the depth of the pool  is 1.5meters.

3.    The 30kg of sand is poured into the airtight container . The container is sealed and then wrapped with the Speedo Fastskin swimsuit. The masking tape is used to hold the swimsuit to the container so that it will not fall off during the experiment.

4.    The assistant waits in the water with the stopwatch. The container covered with the swimsuit material is placed above the water, just touching the surface. The container is released and the stopwatch started. The assistant will stop the stopwatch the moment the container touches the floor of the swimming pool. The test is repeated 3 times and the times clocked  are recorded in the table given below.

5.    Procedures 3 and 4 are repeated using the Aquapel Hydrasuit and the normal polyester swimsuit. The  tests are also repeated 3 times each and all timings are recorded in the table given below.

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Complexity level:
Project cost ($):
Time required:
1 hours to prepare, 2 hours for observation
Material availability:
Swimsuits may be purchased from a swimming gear retail outlet or department store. Alternatively, you might be able to borrow these from friends.
Safety concerns:

Always be careful and aware of the risks of getting/falling into a pool. Adult supervision required. Only swimmers should enter pools.