HOW WE USE HEAT 



(9) which when a garment is rubbed, especially in hot water, 



cling together, causing the garment to (10) Much of the 



warmth of any garment is due to the (11) held within the 



meshes of the cloth. The normal temperature of the body is 



(12) F. Evaporation of water from the surface of the body 



(13) the temperature. In winter (14) colored clothing is 



warmer than (15) colored clothing because it (16) more 



heat. 



STORY TEST 



ELISE GIVES Us SOME IMPORTANT FACTS ABOUT CLOTHING 

 Read carefully and critically. List all the errors and suggest corrections. 



Ever since it was found that fibers could be spun into thread 

 and then woven into cloth, man has had many different kinds of 

 materials from which he can make his clothes. Whether it is the 

 silky rayon made by the silk worm or the linen fibers taken from 

 the seed of plants, it is possible to weave it into many pretty pat- 

 terns. You can tell true rayon from animal silk because it burns 

 with odor of burning feathers and shows nodes along a smooth rod 

 when viewed under a microscope. Cotton can be told from wool 

 because it burns faster and dissolves in alkali. Yesterday I had a 

 temperature of 94.7 F. and Mother kept me in saying I had a fever 

 because the normal temperature is 89.6 F. When we work hard, 

 we increase the body heat and perspiration. Evaporation of the 

 perspiration is a cooling process and so helps to keep the body 

 temperature down to normal. We should choose clothing which 

 checks evaporation in winter and aids it in summer. 



THE REVIEW SUMMARY 



In preparing a summary of what you have learned in this unit, 

 you will want to place emphasis on the big ideas which have come 

 out of the applications of the facts you have learned and the 

 demonstrations you have seen. In this unit look carefully for 

 other generalizations than those which follow : 



1. Heat is present to some degree in all matter. 



2. Our greatest source of natural heat is the sun. 



3. Heat is produced from other forms of energy. 



4. Heat can be transferred through matter or by radiation. 



5. Heat causes many changes in matter. 



6. Heat is essential to the human body. 



