CGS units

In the absence of free charges and current densities, we have in cgs units ... 

Poise = cgs unit of absolute viscosity Centipoise = 0.01 poise Stoke = cgs unit of kinematic viscosity Centistoke = 0.01 stoke Centipoises = centistokes X density (at temperature under consideration)... 

This chapter is the only place in this volume that we encounter electrical units. Certain equations in electrostatics differ by the factor 47t, depending on whether they are written for SI or cgs units. To help clarify this situation, the chapter contains an appendix on electrical units which may be helpful, particularly when references based on other units are consulted. 

From Table 5.7 it will be seen that plasticisers for PVC such as the octyl phthalates, tritolyl phosphate and dioctyl sebacate have solubility parameters within 1 cgs unit of that of the polymer. Dimethyl phthalate and the paraffinic oils which are not PVC plasticisers fall outside the range. It will be noted that tritolyl phosphate which gels the most rapidly with PVC has the closest solubility parameter to the polymer. The sebacates which gel more slowly but give products which are flexible at lower temperatures than corresponding formulations from tritolyl phosphate have a lower solubility parameter. It is, however, likely that any difference in the effects of phthalate, phosphate and sebacate plasticisers in... 

The system of quantities usually associated with cgs units is called the Gaussian system that associated with SI is often called 4D. 

Table 0.1 Conversion factors between SI and cgs units (taking the speed of light in free space as 3 X 10 ms instead of 2.997 92458 x 10 ms- ...

The symbols and are, respectively, the laplacian operators for a single nucleus and a single electron. The variable is the distance between nuclei a and / , Vai the distance between nucleus a and electron i, and the distance between electrons i and j. The summations are taken over each pair of particles. The quantity e is equal to the magnitude of the electronic charge e in CGS units and to e/(47reo) / in SI units, where eo is the permittivity of free space. 

From spectroscopic measurements, we can estimate the fluorescence lifetime, t [. = (PpTi. where the natural lifetime, rN, can be calculated from the Strickler-Berg equation in CGS units [60] ... 

A film of paint, 3 mm thick, is applied to a flat surface that is inclined to the horizontal by an angle 9. If the paint is a Bingham plastic, with a yield stress of 150 dyn/cm2, a limiting viscosity of 65 cP, and an SG of 1.3, how large would the angle 9 have to be before the paint would start to run At this angle, what would the shear rate be if the paint follows the power law model instead, with a flow index of 0.6 and a consistency coefficient of 215 (in cgs units) ... 

The unit of viscosity of fluids in CGS units. It is measured in dynes/cm2 per unit velocity gradient. Poisson s Ratio... 

Fig. 31. Filtered drag coefficient (in CGS units) extracted from simulations over 16 x 16cm domain using 128 x 128 cells. Source Andrews and Sundaresan (2005).

Since L /M — 1 (in cgs units), it follows from a comparison of equations (7.18) and (7.19) that, for exponential decay in bolometric luminosity, v-1 7 Gyr. Thus a single strong initial burst seems to be ruled out as a dominant contributor in the solar neighbourhood. 

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