Physics
Second and third class levers are differentiated by

The type of fulcrum present
The presence of multiple loads
The location of the fulcrum
The location of the load

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 4°C
Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 0°C
Density of the substance to the density of water

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