. Elementary physics and chemistry: second stage . Fig. 70.—A convenient means of obtaining oxygen gas fioni a mixture of potassium chlorate and manganese dioxide. Physical properties of oxygen.—If one of the bottles of gas collected as described is allovv'ed to stand for a minute or two^ and then examined, several of the characters of oxygen can be made out. To begin with, oxygen is an invisible gas. It has neither smell nor taste. It has been found by making careful weighings of the same volumes of oxygen and air that oxygen is a little heavier than air. When made very cold and compressed ve
. Elementary physics and chemistry: second stage . Fig. 70.—A convenient means of obtaining oxygen gas fioni a mixture of potassium chlorate and manganese dioxide. Physical properties of oxygen.—If one of the bottles of gas collected as described is allovv'ed to stand for a minute or two^ and then examined, several of the characters of oxygen can be made out. To begin with, oxygen is an invisible gas. It has neither smell nor taste. It has been found by making careful weighings of the same volumes of oxygen and air that oxygen is a little heavier than air. When made very cold and compressed very much it is changed into a liquid. All these are called physical properties of oxygen. 'The first bottle or two are generally a little cloudy. This cloudiness is due to a substance which is not oxygen. It soon disappears if the bottle is allowed to stand. II. I 2
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1900
