D1298

ISO-3675
Density, Relative Density (Specific Gravity), or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method

This method covers the determination of each mass - volume relationship using a glass hydrometer. Definitions for the three different values are as follows:

Density	(for this method) is the mass (weight in vacuo) of liquid at 15°C. Values are
	reported as kilograms per litre at 15°C
Relative Density	(specific gravity) for this method is the ratio of the mass of a given volume of liquid
	at 15°C (60°F) to the mass of an equal volume of water at the same temperature, hence the reporting of values in the following manner - (Specific Gravity) 60/60°F.
API Gravity	a special function of relative density (specific gravity) 60/60°F, represented by:
	API Gravity, deg = (141.5/sp gr 60/60°F) - 131.5

Values are reported as degrees API (°API) or API Gravity since 60°F is included in the definition.

Also see: D-1298

REAL Services 700 Portage Trail Cuyahoga Falls, OH 44221.3057

voice: 330.630.3700 fax: 330.630.3733