If an object's specific gravity is less than one,
then the object will float. If the object has a specific gravity of
greater than one, it sinks. So dense objects sink in water and less
dense objects float.
Importance of Specific Gravity
Specific gravity is a very important concept in the water/wastewater
field. The specific gravity of a substance will determine where
a compound can be found in water in case of a spill.
Let's consider gasoline. The density of gasoline is 0.6 g/mL and the density of water is 1.0 g/mL. So the specific gravity of gasoline is: