(*) 1 meter = 39.37 inches. 1 cu, in. = 16.387 ccm. (*) 1 inch = 2.54 cm. 1 cu. ft. = 28315 cm. 1 foot = 30.48 cm. 1 cu. m. = 1.308 cu. yd. 1 mile = 1.609 km. (*) 1 liter = 1.057 qt. 1 sq. in. = 6.45 sq. cm. (*) 1 kg. = 2.204 lbs. 1 sq. cm. = 0.155 sq. in. 1 g. = 15.44 grains. 1 sq. m. = 1.196 sq. yd. 1 lb. = 0.4536 kg. 1 acre = 0.405 ha. 1 oz. = 28.35 g. 1 hectare = 2.45 acres. 1 g. = 0.0353 oz. THE C. G. S. SYSTEM. Scientists have devised a plan for expressing any measurement in terms of what are called the _three fundamental units of length_, _mass_, and _time_. The units used are the _centimeter_, the _gram_ and the _second_. Whenever a measurement has been reduced to its equivalent in terms of these units, it is said to be expressed in _C.G.S._ units. Important Topics 1. The metric system; how originated. 2. Units; meter, liter, kilogram. 3. Metric tables. 4. Advantages of the metric system. 5. Equivalents. 6. The C.G.S. system. Exercises 1. Which is cheaper, milk at 8 cents a quart or 8 cents a liter? Why? 2. Which is more expensive, cloth at $1.00 a yard or at $1.00 a meter? Why? 3. Which is a better bargain, sugar at 5 cents a pound or 11 cents a kilogram? Why? 4. Express in centimeters the height of a boy 5 ft. 6 in. tall. 5. What is the length of this page in centimeters? In inches? 6. What is the mass of a liter of water? Of 500 ccm.? Of 1 ccm.? 7. From Chicago to New York is 940 miles. Express in kilometers. 8. A 10-gallon can of milk contains how many liters? 9. What will 100 meters of cloth cost at 10 cents a yard? 10. What will 4 kg. of beef cost at 15 cents a pound? 11. What will 5-1/2 lbs. of mutton cost at 40 cents a kilogram? 12. How can you change the state of a body? Give three methods. 13. Correct the statement 1 ccm. = 1 g. 14. How many liters in 32 quarts? CHAPTER II MOLECULAR FORCES AND MOTIONS (1) EVIDENCES OF MOLECULAR MOTION IN GASES