The Effect of Pressures up to 17,000 Atmospheres upon Some Colloidal Suspensions

In some work which was being conducted at Wesleyan during the past year, on the effect of pressures upon some living organisms, it was noticed that when the water containing these organisms was subjected to pressures of more than a few hundred atmospheres a turbidity was usually developed. This suggested that something in the solution was being precipitated by means of pressure. Upon inspection it was found that this was some of the colloidal constituents in the water, and it was desired to determine whether or not pressure alone would cause the precipitation of a pure colloidal suspension. A number of colloidal suspensions were chosen at random and subjected to pressures varying from a few atmospheres to 17,000 atmospheres

The Rate of Evaporation through Surface Films

The purpose of this investigation was to study the influence of surface tension on the rate of evaporation of water through surface films. We determined the rate of evaporation of pure water and water from solutions of calcium and sodium chlorides of concentrations varying from zero to nearly saturation

Some Recent Developments in High Pressure Windows

The field of optical studies at high pressures has been limited to a range of a few thousand atmospheres not because glass would not withstand a higher pressure but because the proper window support had not been used in order to utilize the maximum strength of the glass

The Dissociation of Some Organic and Inorganic Substances at High Temperature

The following investigation was undertaken to ascertain whether the well-known conductivity in many gaseous reactions at high temperatures is due entirely to the reaction or due partially to the dissociation of one or the other or both of the constituents into charged particles

A Study of the Reactions Involved in a System of Zn and H2SO4 under Pressures Up To 16,000 Atmospheres

A continuation of the investigation described in the previous paper. A method is described for following the rate of the reaction at very high pressures in which the pressure can be varied rapidly and the rate of the reaction continuously read. Very little effect upon the rate of the reaction, directly due to pressure, was noticed up to pressures of 6000 atmospheres. The pressure cells used for this work were exhibited including one that was ruptured at a very high pressure

Some Investigation of the Ethanol Carbontetrachloride System

The Ethanol Carbontetrachloride system has been investigated with respect to the total vapor pressure, and the partial vapor pressures of the constituents at twenty-five and sixty degrees. The total pressures of different mixtures of Ethanol Carbontetrachloride were determined at twenty-five degrees by means of a bulb to which was sealed a manometer. The total pressure at sixty degrees was measured by means of an apparatus designed by the authors for the rapid and accurate determination of the vapor pressures of liquids that do not readily react with mercury. A description of this apparatus will appear in the Journal of Industrial and Engineering Chemistry. The Partial pressures were determined from the molfraction of each constituent in the vapor. The molfractions of each constituent in the vapor were determined by condensing a small amount of vapor and determining its density. Curves were plotted for each temperature representing the total and partial pressures

Lens Effect of Pressure Windows

The lens effect of pressure windows has been studied at pressures as high as 30,000 atmospheres. These lens effects are found to be due to four primary causes. 1st. Pseudo lens effect caused by temperature gradients in the material under pressure. 2nd. The bulging of the outside surface of the pressure windows. 3rd. The Pseudo lens effect due to unequal strains in the glass. 4th. The bulging of the inside surface of the window combined with the difference of index refraction of the material under pressure and the glass or quartz of the window. Methods for correcting for these lens effects are outlined

The Rate of Solution of Zn in H\u3csub\u3e2\u3c/sub\u3eSO\u3csub\u3e4\u3c/sub\u3e Under Pressures up to 347 Atmospheres

A study is made of the factors influencing the rare of solution of Zn in H2SO4. The conditions of the surface, the local concentration of the acid at the surface of the Zn, and the size and shape of the pieces of Zn are found to be very important factors while pressures up to 347 atmospheres have very little direct influence upon the rate of reaction. The pressure cell used for this work was exhibited