Scientific amusements . Apparatus for generating hydrogen by flask. A very easy method of producing hydrogen is to put apiece of sodium into an inverted cylinder full of water,^standing in a basin of water. The sodium liberates thehydrogen by removing the oxygen from the liquid. WATER-SYMBOL HoO ; ATOMIC WEIGHT page 4 of this volume we said something aboutwater, and remarked (as we have since perceived by ex-periment) that water is composed of oxygen and hydrogenin proportions, by weight, of eight of the former to oneof the latter gas ; in volume, hydrogen is two to one ; 72 CHEMISTRY. a
Scientific amusements . Apparatus for generating hydrogen by flask. A very easy method of producing hydrogen is to put apiece of sodium into an inverted cylinder full of water,^standing in a basin of water. The sodium liberates thehydrogen by removing the oxygen from the liquid. WATER-SYMBOL HoO ; ATOMIC WEIGHT page 4 of this volume we said something aboutwater, and remarked (as we have since perceived by ex-periment) that water is composed of oxygen and hydrogenin proportions, by weight, of eight of the former to oneof the latter gas ; in volume, hydrogen is two to one ; 72 CHEMISTRY. and we saw that volume and weight were very differentthings. This we will do well to bear in mind, and that,to quote Professor Roscoe, Water is always made up ofsixteen parts of oxygen to two parts of hydrogen byweight ; sixteen and two being eighteen, the combiningweight of water is eighteen. We can prove by the Eudiometer that hydrogen whenburnt with oxygen forms water ; and here we must. Blowing bubbles with hydrogen gas. remark that water is not a mere mechanical mixture ofgases, as air, is. Water is the product of chemical com-bination, and as we have before said, is really an oxide ofhydrogen, and therefore combustion, or electricity, must becalled to our assistance before we can form water, which isthe result of an explosion, the mixture meeting with anignited body—the aqueous vapour being expanded by ancients supposed water to be a simple body, butLavoisier and Cavendish demonstrated its true character. WATER. 73 Pure water, at ordinary temperatures, is devoid of tasteand smell, and is a transparent, nearly colourless, viewed in masses it is blue, as visible in a markeddegree in the Rhone and Rhine, at Geneva and Balerespectively. Its specific gravity is i, and it is taken asthe standard for Sp. Gravity, as hydrogen is taken as thestandard for Atomic Weight. The uses of water and thevery important part it playsin the arrangements ofnature a
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