30 ELEMENTARY GENERAL SCIENCE CHAP. 



The exercise also demonstrates that volume involves length, 

 height, and breadth. 



EXPT. 39. Construct a cubical box of a decimetre edge 

 out of cardboard, and make it water-tight by varnishing. 

 The capacity or volume of such a box is a cubic decimetre or 

 a litre. Make similar boxes 1 cubic centimetre and 1 cubic 

 inch in capacity. 



EXPT. 40. Procure a half -pint glass measure graduated 

 into fluid ounces, and one graduated into cubic centimetres. 

 Use these glasses to determine the number of c. cm. in a 

 half -pint, and the number of fluid ounces which are equal to 

 1,000 c. cm., that is, 1 litre. 



EXPT. 41. Fill the cubic inch box, from Expt. 39, 

 with water, and by pouring the water into the jar graduated 

 into cubic centimetres, determine the number of c. cm. in a 

 cubic inch. 



Relation between British and Metric Units of Volume. 



These exercises approximately show the relations between the 

 units of volume or capacity in the British and metric systems of 

 measurement. The exact equivalents are as follows : 



Metric to British. 



1 cubic centimetre = 0'061 cubic inch. 



1 cubic decimetre = 61 '027 cubic inches. 



1 cubic metre = 35 '316 cubic feet. 



= 1*308 cubic yards. 

 1 litre = 1761 pints. 



British to Metric. 



1 cubic inch = 16 '386 cubic centimetre^ 



1 cubic foot = 0'028 cubic metre. 



= 28 '315 cubic decimetres. 



1 cubic yard = 0'764 cubic metre. 



1 pint = 0'568 litre. 



1 quart = 1'136 litres. 



1 gallon = 4 '543 litres. 



Simple Application of Volume Measurement. The student 

 cannot have failed to notice that the 



volume of a cube = area of the base x height 



( in, e.g., c. cm. of c. inches). (in, e.g., sq. cm. or sq. (in, e.g., cm. or 



inches). inches). 



