The specific gravity of a substance or liquid, including water, the reference liquid, is going to change depending on temperature and pressure. That is why a standard temperature and pressure are used in the calculation of specific gravity. If those outside influences are not regulated, specific gravity will change.

What affects specific gravity?

Increases in specific gravity (hypersthenuria, i.e. increased concentration of solutes in the urine) may be associated with dehydration, diarrhea, emesis, excessive sweating, urinary tract/bladder infection, glucosuria, renal artery stenosis, hepatorenal syndrome, decreased blood flow to the kidney (especially as a ...

Does specific gravity change with temperature?

Specific gravity is dependent on the temperature, and most of the values found in the literature refer to STP conditions. Although the two terms often are used interchangeably, there is a technical difference between specific gravity and density. Density is defined as the mass per unit volume of a substance.