. Introduction à la chimie inorganique . la hauteur de la surface du mer-cury sur la droite au-dessus de celle sur les restes a été mesurée, plus de mercure peut maintenant être ajouté du réservoir, Et la différence entre les deux niveaux a de nouveau noté.le gaz ne peut pas avoir diminué en quantité, mais il occupe maintenant un espace plus petit, et est donc emballé moreclosauly — sa concentration est plus grande qu'avant. Si, par exemple, la différence de niveau est maintenant deux fois plus grande, on trouvera que la concentration du gaz est également deux fois plus grande (son volume ayant becommoitié du volume original). Quel que soit le nom

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. Introduction to inorganic chemistry . he height of the surface of the mer-cury on the right above that on the lefthaving been measured, more mercury maynow be added from the reservoir, and thedifference in the two levels again noted.The gas cannot have diminished in amount, yet it now occupies a smaller space, and is, therefore, packed moreclosely — its concentration is greater than before. If, for example, thedifference in level is now twice as great, it will be found that the con-centration of the gas is also twice as great (its volume having becomehalf of the original volume). Whatever amount of mercury is added, we shall always find that the concentration of the gas is proportionalto the height of the mercury. But this in turn is proportional to theweight of metal. The weight of mercury on one side must, therefore, be equal to the stress or pressure or tension of the gas on. the otherside which balances it. Hence, the ooncentrationB of a sample of anygas are proportional to the corresponding pressures it exercises. We. rio. 24. 82 INORGANIC CHEMISTRY determine, therefore, the denseness with which any sample of gas ispacked by. measuring its pressure. Method of Allowing for Varying Concentration in Measur-ing Quantity in Gases, — The principle just stated is applied to themeasurement of the quantity of matter in a sample of gas by per-mitting the concentration of the sample to alter until it is equal tothat of the atmosphere at the moment. Then weread off the volume now occupied, and simulta-. neously we ascertain the pressure by observingthat of the atmosphere. Each of these two oper-ations is facilitated by a special arrangement ofapparatus. A gas to be measured is always confined sothat some liquid constitutes one part of the barrierto its escape. The very simplest form of theapparatus is shown in Fig. 25. To render theconcentration (and pressure) of the gas equal tothat of the atmosphere, the cylinder containingthe gas is lowered (or raised) until the lev

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