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Updated: June 1, 2025
To find the size of a drop, we make use of the investigations made by Sir George Stokes on the rate at which small spheres fall through the air. In consequence of the viscosity of the air small bodies fall exceedingly slowly, and the smaller they are the slower they fall." * Professor Thompson gives us the formula by which Stokes made his calculation.
On the other hand, a radius of about ten miles from the centre would probably include all the streams of trachyte; so much greater has been the viscosity of the basalt over the latter rock.
As far as we have ascertained, in gum solutions there is a steady diminution in viscosity with increase of temperature until a certain temperature is reached, beyond which increase of heat does not markedly influence the viscosity, and it is possible that above this "critical point," as we may term it, the gum solutions once more begin to increase in viscosity.
When the liver does not have to take care of toxins generated by the current food intake, each passage through the liver results in a cleaner blood stream, with the debris decreasing in quantity, viscosity, and toxicity, until the blood becomes normalized. During fasting, debris from the gall bladder still pass through the small intestine and into the large intestine.
When I approached it, I saw that its face was not so smooth as it had appeared from half a mile back; nor was it motionless. In fact, it was rolling south and west like a wave of great viscosity.
Now, for the first time, vast masses of basalt and dolerite are extruded both from vents of eruption and fissures; and, owing to their extreme viscosity, spread themselves far and wide until they reach the margin of some uprising ground of old Palæozoic or Metamorphic rocks by which the volcanic plain is almost surrounded.
During the time of deformation, and during that time only, the first make their influence felt. They depend essentially on the greater or less rapidity of the deformation, they cease with the movement, and could not, in any case, bring the body back to its pristine state of equilibrium. The existence of these reactions leads us to the idea of viscosity or internal friction.
These discoveries were made at a depth of only two or three feet from the surface of the ground, and are within about a quarter of a mile of other Roman remains which were similarly brought to light a few months ago. Subjoined is a table giving the absolute viscosity of various gums. The absolute viscosity of water at 15° C. determined in four different instruments is shown below.
I have not rejected any by design, merely because they were unnecessary or exuberant; but have received those which by different writers have been differently formed, as viscid, and viscidity, viscous, and viscosity. Compounded or double words I have seldom noted, except when they obtain a signification different from that which the components have in their simple state.
In certain cases observed long ago with what are called pasty bodies, this viscosity attains a value almost comparable to that observed by M. Spring in some solids. Nor does rigidity allow us to establish a barrier between the two states.
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