What are the standard temperature and pressure conditions enthalpy is usually measured under

temperature must be 273 Kelvin (0°C)

pressure must be 1 atm

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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he would use the colour black