Density has to have units e.g. g/cm3 tonnes/m3 lbs/cu ft.
Specific gravity (s.g.) is a way of avoiding the units problem. It expresses density relative to the density of water. Water has a s.g. of one.
An object with an s.g.<1 will float in water.
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When one factor is less than one, the product will be less than the other factor.
It is less than. You see if its not one whole than its less than one.
One is less than two.
Neither, but one fourth is less than three fourths.
One less than a score is nineteen.