Is there something wrong with my calculation?

Let's say you have a plastic cylinder closed off at either end. It is 10cm long and has a radius of 1.5cm. Is its volume therefore 10 * (pi * 1.5^2)cm^3? Since this equals 70.7, and water has a density of 1g/cm^3 should this not mean that the cylinder could weigh anything up to 70.7 grams before it would... show more Let's say you have a plastic cylinder closed off at either end. It is 10cm long and has a radius of 1.5cm. Is its volume therefore 10 * (pi * 1.5^2)cm^3? Since this equals 70.7, and water has a density of 1g/cm^3 should this not mean that the cylinder could weigh anything up to 70.7 grams before it would sink?

I ask because I did an experiment like this and the results didn't fit my calculation.
Many thanks in advance for any help.
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