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Originally Posted by SaintessHeart
Simple. Wring/compress the sponge underwater until no more air bubbles come out, then let it absorb more water.  |
How can you move that sponge to an oil container without any water to be lost during the process through? That's actually what i meant
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Sponges don't sink by themselves unless a pressure is applied on it to sink, or the mass of water absorbed by the sponge outweighs the entire dry sponge itself, meaning which the sponge has to be really thin. The trapped air pockets totaled up will counteract to the water absorbed and let it stay afloat, similar to the concept of why wood floats on water.
Filling the cup full of liquid isn't exactly a good idea because of the molecular structure of water that result in hydrogen bonds, resulting in a less than accurate measurement of volume. Markings below the filling point are often used in Archimedes-type experiments to counteract this error when the container has a large area.
Volume/density formula is a good idea though. There should be a few more control group sets with the same sponge and liquids to get a more accurate mean value.
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Well we can just push it down by hand, then fill the water to the mark if it can't sink.
I planned to ignore the hydrogen bond at first to make it less complicated, and since expected the error is small enough. But if can't be help then either using a large beaker, or more extreme, a specific design volumetric flask (that have an opening to put the sponge in and a small neck to reduce error)
