GAS VOLUMES AND WEIGHTS.
Quantitative experiments with oxygen and hydrogen—Problems
AN INTRODUCTION TO CHEMICAL SCIENCE
CHAPTER I.
THE METRIC SYSTEM.
1. The Metric System is the one here employed. A sufficient knowledge of it for use in the study of this book may be gained by means of the following experiments, which should be performed at the outset by each pupil.
2. Length.
Experiment 1.—Note the length of 10 cm. (centimeters) on a metric ruler, as shown in Figure 1. Estimate by the eye alone this distance on the cover of a book, and then verify the result. Do the same on a t.t. (test-tube). Try this several times on different objects till you can carry in mind a tolerably accurate idea of 10 cm. About how many inches is it?
In the same way estimate the length of 1 cm, verifying each result. How does this compare with the distance between two blue lines of foolscap? Measure the diameter of the old nickel five- cent piece.
Next, try in the same way 5 cm. Carry each result in mind, taking such notes as may be necessary.