Physics
Specific gravity is defined as the ratio of

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

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Physics
Superconductors are substances which

offer high resistance to the flow of current
conduct electricity at low temperature
offer no resistance to the flow of electricity
conduct electricity at high temperatures

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