Avoid These Highly Acidic Foods. 1  All meats such as pork, fish, seafood and poultry. 2  Dairy and eggs. 3  Grains and some legumes. 4  Artificial sweeteners, alcohol products, sugar, carbonated soft drinks. 5  Cigarettes and tobacco, coffee, black tea.
In more general terms specific gravity is the ratio of the density of a material to that of any standard substance, although usually this is water at 4 degrees Celsius or 39.2 degrees Fahrenheit. By definition, water has a density of 1 kg per litre at this temperature. The specific gravities of gases usually are compared to dry air which generally has a density of 1.29 g per litre. The specific gravity of all other materials is compared to water as a fraction heavier lighter or heavier density.
Specific Gravity and Density tests can be used to identify a material or to follow physical changes in a sample. Specific Gravity and Density tests can also be used to indicate the degree of uniformity or variability among different sampling units or specimens, or to indicate the average density of a large item.ASTM Standards: 1  D1475.bout Specific Gravity & Density Determiniation. Specific Gravity is a measure of the ratio of the mass of a given volume of material at 23 Â°C to the same volume of water.