The heats of solution of rhombic sulphur in carbon disulphide were measured over the concentration range 6 to 17% of sulphur and at 20° and 25 °C., and the specific heats of these solutions were calculated. The apparatus designed for these measurements is described. By measuring the heat of solution of finely divided sulphur and its particle size, the surface energy of solid rhombic sulphur is estimated.

Measurements of the dielectric constants of binary systems have been made; hexane, benzene, toluene, acetone, isopropyl alcohol, and nitrobenzene have been used two at a time. It was the purpose to obtain accurate data for the dielectric constants for the 15 systems over the whole range of concentrations from 0 to 100%, with the absolute accuracy of 0.1%. It is claimed that the relative accuracy is of this order. From the data obtained regularities have been found which are expressed in the form of empirical equations which summarize the data. Tentative suggestions regarding theoretical conclusions are made in a number of cases.

A preliminary account is given of an experimental technique by means of which the specific heats of gases may be measured at high temperatures and pressures. With the transducer employed consistent results were obtained up to 7000 p.s.i. and it is proposed to incorporate a transducer having a much higher pressure range where it is estimated that temperatures up to 10,000 °K can be recorded.

A modification in the employment of the direct current method of measuring conductivities is described. The main objective is that pure metallic probe and current carrying electrodes can be used, thus making it possible to investigate the conductivity of solutions such as hydrogen peroxide, aqua regia, etc. This necessitates a choice of electrodes which are inert to such solutions. An electrometer having an infinite resistance so as to avoid any polarization at the probes, in this case the quadrant electrometer, is described in its use as a null instrument. An accuracy as high as or greater than that of the alternating current method could be obtained. Furthermore, this method entails greater equipment economy and simplicity in apparatus required.

A method has been developed whereby current yields of as high as 70% of anodically discharged hydrogen can be maintained during continuous electrolysis of lithium hydride at or just below its melting point. Efforts to utilize this process for the separation of hydrogen and deuterium were unsuccessful.

Measurements of the equivalent conductance of sulphuric, nitric, and hydrofluoric acids were made in water – hydrogen peroxide mixtures by means of a direct-current method. It was found that in solvents containing a high percentage of hydrogen peroxide the conductivities of these acids were extremely low, and it is proposed that this results from a marked decrease in their degrees of dissociation. This proposal is supported by similar measurements made on the system water – strong acid – weak acid.

The conductivities of HCl, H 2 SO 4 , HNO 3 , and a number of their alkali metallic salts were measured in ethylene glycol. The influence of the addition of water, methanol, and hydrogen peroxide was determined. The results are discussed on the basis of well-known theories of electrolytic conductivity involving H + ions.

A new adiabatic calorimeter is described in which transfer of the material under investigation from the thermostat to the calorimeter is effected through an evacuated space.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChanges in the Liquid State in the Critical Temperature Region.O. MaassCite this: Chem. Rev. 1938, 23, 1, 17–28Publication Date (Print):August 1, 1938Publication History Published online1 May 2002Published inissue 1 August 1938https://pubs.acs.org/doi/10.1021/cr60074a002https://doi.org/10.1021/cr60074a002research-articleACS PublicationsRequest reuse permissionsArticle Views102Altmetric-Citations38LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

The adsorption of lime on cellulose and wood has been measured. On the basis of molecular proportions, the magnitude of the adsorption is shown to be much greater than that of sodium hydroxide. It is found that considerable time is required for saturation adsorption to take place. The adsorption on similar wood species is shown to be the same and much greater than on cotton cellulose.

Values for the heat capacities of solid deuterium oxide and the resulting liquid, from initial temperatures between 4 °C. and − 78.5 °C. to a final temperature of 25.0 °C, have been determined. The specific heats of the solid over the temperature range 0 to − 70 °C. have been measured. The latent heat of fusion of deuterium oxide has been determined. The specific heat of liquid deuterium oxide is shown to be greater than that of water in the temperature region in which measurements were made. A comparison of the thermal properties of deuterium oxide with those of hydrogen oxide has been made, and certain points of interest are indicated.

Preliminary determinations of the specific heats of liquid deuterium oxide from 4° to 65 °C. are described. The average specific heats over the temperature ranges 4° to 26 °C., 26° to 45 °C., and 26° to 65 °C., are 1.018, 1.003 and 1.008 respectively, while the average specific heat between 4° and 65 °C. is 1.01 cal. per gm. per degree.

The solubility of lime has been determined with a high degree of accuracy over the temperature range 0 to 30 °C. by a conductivity method. The degree of dissociation of lime over this temperature range and over the concentration range 0 to 1.164 gm. of calcium oxide per litre has been calculated.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Sorption of Sodium Hydroxide on Cellulose and WoodR. RichardsonR. RichardsonMore by R. Richardson and O. MaassO. MaassMore by O. MaassCite this: J. Phys. Chem. 1932, 36, 12, 3064–3073Publication Date (Print):December 1, 1932Publication History Published online1 May 2002Published inissue 1 December 1932https://doi.org/10.1021/j150342a017RIGHTS & PERMISSIONSArticle Views39Altmetric-Citations1LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (433 KB) Get e-Alerts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA NEW TYPE OF ROTATING ADIABATIC CALORIMETER. THE SURFACE ENERGY AND HEAT OF SOLUTION OF SODIUM CHLORIDE. IIS. G. Lipsett, F. M. G. Johnson, and O. MaassCite this: J. Am. Chem. Soc. 1927, 49, 8, 1940–1949Publication Date (Print):August 1, 1927Publication History Published online1 May 2002Published inissue 1 August 1927https://doi.org/10.1021/ja01407a013RIGHTS & PERMISSIONSArticle Views128Altmetric-Citations26LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (593 KB) Get e-Alerts Get e-Alerts