Physics
Blowing Air with open pipe is an example of :

Isochroric process
Adiabatic process
Isobaric process
Isothermal process

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Physics
Specific gravity is defined as the ratio of

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

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