体积/密度测定

时间:2014-09-11    浏览:2882次

密度测定

Density specifies how much of a substance occupies a defined volume at a stated temperature and pressure. The density of a substance can be used to define the substance and it performance character.

Controlling the density of finished goods is often desirable for performance as well as economic considerations. For this reason, many manufacturers strive to develop materials that are partially porous yet still fulfill their function while others seek an end product of maximum density.

In the manufacture of foams, density is a function of the chemistry used to produce the foam, of additives used to increase the density, and of any additives used to improve the combustion resistance properties of the foam.

Accurate density measurements are an important part of characterizing the physical properties of ceramics. Density is used to determine the desired performance of parts created using Additive Manufacturing. It is also a key element utilized in Pharmaceutical Roller Compaction operations and can be used as an indicator of tablet strength and dissolution.

Density influences the overall quality of manufactured products and density measurements guide the manufacturing process. For this reason, Micromeritics gas pycnometers (AccuPyc and GeoPyc) are used worldwide to characterize raw materials as well as to determine the density of finished products.

压汞法测孔径和孔体积

The porosity of a material affects its physical properties and, subsequently, its behavior in its surrounding environment. The term "porosity" is often used to encompass the measurements of pore size, volume, distribution, density, and other porosity-related characteristics of a material. The adsorption and permeability, strength, density, and other factors influenced by a substance’s porosity determine the manner and fashion in which it can be appropriately used.

The AutoPore IV is a high-pressure mercury intrusion porosimeter that provides extremely accurate, fully automated porosity measurements with a high dynamic range, and is suitable for a wide variety of applications. Mercury Porosimetry routinely is applied over a capillary diameter range from 0.003 to 360 μm (five orders of magnitude). This would be equivalent to using the same tool to measure accurately and precisely both the height of a 30-story building and the diameter of a grain of sand.