1.1 ,This test method covers the determination, using a glass thermohydrometer in conjunction with a series of calculations, of the density, relative density, or API gravity of crude petroleum, petroleum products, or mixtures of petroleum and nonpetroleum products normally handled as liquids and having a Reid vapor pressures of 101.325 ,kPa (14.696 ,psi) or less. Values are determined at existing temperatures and corrected to 15 ,°,C or 60 ,°,F by means of a series of calculations and international standard tables.