THE HEAT OF THE BODY 



121 



.-thermometer 



temperatures, you will find that the tube surrounded by 

 the dark cloth shows a higher temperature than the other 

 tube. Evidently ab- 

 sorption of radiant en- 

 ergy has been the cause 

 of this difference in 

 temperature. In the 

 winter we wish to put 

 a nonconductor be- 

 tween the body and 

 the outside cold air. 

 For this reason fur 

 coats and other dense 

 materials are used. 

 We sometimes place 

 a newspaper over our 

 chest when going into 

 a cold wind. Can you 



explain Scientifically In which tabe ^ the thermometer register 



the reasons for this? higher? why? 



SELF-TESTING EXERCISE 



Select from the following list those words which best fill the blank spaces 

 in the sentences below and arrange the words in proper numerical order. 

 A word may be used more than once. 



reduces 



98.6 



loss 



silk 



scales 



76.4 



warmth 



heat 



wool 



shrink 



rayon 



air 



rubber 



nodes 



light 



fibers 



absorbs 



elasticity 



dark 



stretch 



cold 



replaced 



heats 



smoothness 



evaporates 



silky 



hot 



wool 



of 



In cold regions clothing is very useful to prevent (1)_ 



(2) from the body. Of the animal fibers (3) and (4) , 



(5) is the more common while (6) make more beautiful 



fabrics. In recent years (7) has to a large extent (8) 



silk because of its low cost. The rough texture of wool is due to 



