The purpose of the following paper is to review all the forms of pressure regulators which have been devised; to suggest new forms and modifications; and t o classify them according t o the methods of pressure regulation. Scientific literature contains references to but few forms of manostats. Pressure is one of the variables which so often determine the velocity, direction and equilibrium of reactions; therefore, it is frequently necessary t o control pressure-to keep it constant and to vary it at will. Some of the uses for which manostats are adapted are: Determination of vapor-pressures and boiling-points. Distillation under pressure. Study of the velocity of reaction. Constant temperature bath. Desiccation in vacuo or under pressure. Work involving the use of the Phase Rule (particularly where there is a vapor-phase). Although pressure is a factor in so many reactions and equilibria, the effect of a change in pressure is usually relatively small. For example, to change the boiling-point of water from 1 0 0 ' to 9 9 O , requires a change in the pressure of 33 mm Hg. Therefore a manostat, in order to be serviceable for general laboratory work, need not be so accurate or so sensitive but should possess a wide range of pressures.
Knowing the atmospheric pressure, the per cent by volume of benzene vapor is computed. A modification of the apparatus employed by Burrell and Robertson has been suggested by Whiton1 as being more desirable for use in determining the efficiency of the benzol scrubbers used on coke-oven gas.
FUMING SULFURIC ACID METHODThe determination of the combined benzene and ethylene content of an illuminating gas by fuming sulfuric acid may be utilized for the indirect determination, of benzene when the amount of ethylene is determined RESEARCH ON THE DETECTION OF ADDED WATER IN MILK
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