What is a specific surface area?
A specific surface surface is a measure of a solid object. It compares the surface area of the building either with its mass, and is particularly important in materials such as soil or with materials that are theoretically smooth surface, but in fact they have defects such as scratches. There are several measurement techniques that can bring different results, each method suitable for specific types of material.
From a mathematical point of view, this is a very simple concept. For example, 4 inches (10 cm) cubes (10 cm) have a total surface of 6 x 4 inches x 4 inches, which are 96 square inches (660 square centimeters). If the cube has a weight of 7 ounces (approximately 200 g), a specific surface area is 13.7 square inches per ounce (approximately 3.3 square centimeters per gram). For example, the cube set will have a slightly different area and weight to a clean cube due to crumbs indicating the number. Whether this leads to a higher or lower specific surface area depends on the size and depth of the wells. Theoretically bIt can have all the dice the same specific surface surface as each other, but if they are not consistently produced, there may be variations. This concept may apply to a much finer scale, for example in scratches on an otherwise smooth piece of metal.
There are three main ways of measurement of a specific surface area. The first is through adsorption, which is a place where the gas, liquid particles or dissolved solid sticks on the measured material; A common example of the process is when the moisture is soaked with silica gel. A complex formula known as the Bet equation can calculate the specific surface surface by means of data observed during this process. However, the result varies depending on what material is used in adsorption.
simpler measures, most suitable for materials such as soil, is the distribution of particles. This includes the use of different methods to sort individual material particles bysize. This can be done as simply using a number of sizes or so complicated as the use of laser beams.
The third method is used for powder materials. It involves urge gas such as air through the bed of powder and resistance measurement caused by particles. One of the common uses of this method is the assessment of powder cement quality, the idea is that the specific surface area will affect how quickly it sets.