By Durand W. F.
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Additional info for Shock or Water Ram in Pipe Lines with Imperfect Reflection at the Discharge End and Including the Ef
However, the eventual transition to the friable low-density cubic form can be very sudden, l Using the concept of a unit cell, together with data on the atomic mass of constituent atoms, it is possible to derive a theoretical value for the density of a pure single crystal. 286 64 nm. 023 55 nm 3. e. (8x~1 a t o m ) + 1 atom. 85 is the relative atomic mass of iron. The theoretical density (mass/volume) is thus 7875 kg m -3. The reason for the slight discrepancy between this value and the experimentally-determined value of 7870 kg m -3 will become evident when we discuss crystal imperfections in Chapter 4.
The overall (A13+ + Si 4+):O 2- ratio is always 1:2 for zeolites. In their formulae, (H20) appears as a separate term, indicating that these water molecules are loosely bound. In fact, they can be readily removed by heating without affecting the structure and can also be re-absorbed. Alternatively, dehydrated zeolites can be used to absorb gases, such as carbon dioxide (CO2) and ammonia (NH3). Zeolites are wellknown for their ion-exchange capacity ~ but synthetic resins now compete in this application.
Layers can be readily sheared past each other, thus explaining the lubricity of graphitic carbon. ). The ratio of property values parallel to the a-axis and the c-axis is known as the anisotropy ratio. ) Special synthesis techniques can produce near-ideal graphite ~ with an anisotropy ratio of thermal conductivity of 200. 13a). Before examining some selected ionic compounds, it is necessary to develop this aspect of coordination more fully. This approach to structure-building concerns packing and is essentially a geometrical exercise.