CHEMISTRY IN DAILY LIFE LECTURE I Breathing-Physics and chemistry-The weight of the air-Analysis of air-Argon-Difference between inspired and expired breath- Maintenance of the warmth of the body-Combustion-Matches -Yellow and red phosphorus. IN the lectures which begin to-day I hope to convince you that a foundation of chemical knowledge is needed for understanding many occurrences of everyday life. We shall see that there are many facts which have become so familiar to us by custom that we pay scarcely any heed to them, and seldom give ourselves the trouble of thinking about the more intimate relations of them. Let us begin by considering an action which we perform constantly-the action, namely, of breathing. We speak of the duration of our lives as the time between our first and last breaths. At once we are faced by the question, What do we breathe, and for what purpose do we breathe ? Every one knows that we breathe the air which surrounds us. But what is this air? Here it iTable...

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