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.
The usage of specific gravity notation is useful in the metric system, where the density of water is typically taken as 1000 kilograms per meter cubed. Multiplying the specific gravity of a material by 1000 yields the density of the material in kilograms per meter cubed. Dividing 1000 by itself yields the specific gravity of water, which is one. The larger the specific density of a material, the more dense the material is than water. Specific density can be used to determine whether solids of different materials float or sink in water. If the material specific gravity is greater than one, it sinks in water.