Disagreements of this order of magnitude can be expected as the NBS and the ASBC used slightly different values for the density of air and pure water in their calculations for converting to apparent specific gravity.
2.
But as specific gravity usually refers to highly incompressible aqueous solutions or other incompressible substances ( such as petroleum products ), variations in density caused by pressure are usually neglected at least where apparent specific gravity is being measured.
3.
This is called the Apparent Specific Gravity, denoted by subscript A, because it is what we would obtain if we took the ratio of net weighings in air from an analytical balance or used a hydrometer ( the stem displaces air ).
4.
Since the density of dry air at 1013.25 mb at 20 �C is 0.001205 g�cm " 3 and that of water is 0.998203 g�cm " 3 the difference between true and apparent specific gravities for a substance with specific gravity ( 20�C / 20�C ) of about 1.100 would be 0.000120.
5.
A sucrose solution with an apparent specific gravity ( 20?/ 20 �C ) of 1.040 would be 9.99325 �Bx or 9.99359 �P while the representative sugar body, the International Commission for Uniform Methods of Sugar Analysis ( ICUMSA ), which favors the use of mass fraction, would report the solution strength as 9.99249 %.
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