UNITS OF LENGTH, AREA AND VOLUME 



23 



Length in centimetres. 



Length in inches. 



No. of centimetres. 

 No. of inches. 



EXPT. 26. Draw a line a metre long and one a yard long close 

 to it. Measure the length of the metre line in inches and 

 fractions of an inch, and the length of the yard line in centi- 

 metres. In this way find 



Number of inches in one metre = 39 '3, 

 Number of centimetres in one yard = 91 '4. 



EXPT 27. Draw a line one foot long and find its length in 

 centimetres ; draw another a decimetre long and find its 

 length in inches. In this way determine 



Number of centimetres in one foot = 30'5, 

 Number of inches in one decimetre = 3 '9, 



EXPT. 28. Measure the length of your desk, or of a table, 

 or other convenient object, in inches and decimals (tenths) of 

 an inch. Determine the same length in metres and decimals 

 of a metre. Use the results to determine the number of 

 inches in a metre, thus : 



Relation between British and Metric Units of Length. 



The exact relations between linear measures in the British and 

 Metric systems of units are shown in the following tables, and 

 also in Fig. 13. 



Metric to British. 



1 millimetre = 



1 centimetre = 



1 decimetre = 



1 metre 



1 metre 



1 metre 



1 kilometre = 



0-039 inch. 

 0-394 inch. 

 3-937 inches, 

 39-371 inches. 

 3-281 feet. 

 1 "094 yards. 

 0-621 mile. 



