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Some others tend to float while others tend to sink due to the density of the object or a body. For an object to sink, it must have a greater density than water, which is 1 g/cm^3, hence for an object to float, its density must be less than water. This concept may also vary depending on the type of water, since, saltwater is denser than freshwater. The application of this concept can be seen during swimming lessons, whereas you are asked to spread your arms in order to float, this is due to the fact that you're relatively increasing your volume, which affects your density.