18 LABORATORY MANUAL 



What error did you make? What is the reason for 

 the error? 



B. Measurements. 



Accurately measure the length, width, and thickness 

 of the top of the laboratory table, using the metric 

 rule. Calculate the area of the top in square centi- 

 meters and in square meters. Also calculate the 

 number of cubic centimeters in the table top. Change 

 all of these metric readings into English values. Make 

 the same measurements, using the English rule. Find 

 the area of the table top in square inches, square feet 

 and square yards. Compare all of these results with 

 your calculated results. 



C. Examine a box of metric weights. Study the 

 small or fractional w r eights. 



What relation do these small weights have to a 

 gram weight? Arbitrarily select six different com- 

 binations of small and large weights and express each 

 of these values in grams. Have the instructor verify 

 your readings. 



D. Comparison of the English and metric units of 

 weight. 



(a) Weigh a one pound weight as accurately as you 

 can, using metric weights. Record your result. 



(b) Weigh a two pound weight in the same way. 

 Find the average of both readings. How many grams 

 in a pound? 



(c) Weigh an ounce to find the number of grams 

 to which it is equivalent. Get the correct values from 



