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.
Apparent specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance. The reference substance is nearly always water at its densest (4Â°C) for liquids and for gases it is air at room temperature (21Â°C).n scientific work, the relationship of mass to volume is usually expressed directly in terms of the density (mass per unit volume) of the substance under study. It is in industry where specific gravity finds wide application, often for historical reasons.