The Metric System vs. The Imperial System. Change?

litre (l)

Encyclopædia Britannica Article

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also spelled liter unit of volume in the metric system, equal to one cubic decimetre (0.001 cubic metre). From 1901 to 1964 the litre was defined as the volume of one kilogram of pure water at 4 °C (39.2 °F) and standard atmospheric pressure; in 1964 the original, present value was reinstated. One litre is equivalent to approximately 1.0567 U.S. quart.

Liter: A metric measure of capacity that, by definition, is equal to the volume of a kilogram of water at 4 degrees centigrade and at standard atmospheric pressure of 760 millimeters of mercury.

Why wasn't the specific gravity of the water mentioned?

SUBJECT : Specific gravity 7-12

The term specific gravity is used to describe the weight or density of a liquid compared to an equal volume of fresh water at 4°C (39° F). If the liquid you are comparing will float on this water it has a specific gravity of less than one (1). If it sinks into the fresh water the specific gravity is more than one. As you have already guessed fresh water at 4°C (39° F) has been assigned a value of one (1).