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API gravity is necessary for the calculation of specific gravity of petroleum products, because(a) Volume of the petroleum products changes with temperature(b) Mass of petroleum products changes with temperature(c) Potential energy of petroleum products changes with temperature(d) None of the mentionedI have been asked this question in an interview for job.This interesting question is from Specific Gravity topic in section Moles, Density & Concentration of Basic Chemical Engineering

Answer»

Right choice is (a) VOLUME of the petroleum products changes with temperature

The BEST I can explain: Since volume of petroleum products changes significantly with temperature, that means DENSITY of petroleum products changes significantly with temperature, so that’s why specific gravity of petroleum products changes with temperature, and that’s why API gravity is REQUIRED.



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