HEATING BUILDINGS in 



8. Examine your heating system. What kind is it? How does 

 the heat of the fire get to the air in the rooms? 



9. Light a candle and take -it to different parts of the room and 

 note which way the air is moving. Make a drawing to show the 

 circulation of the air. 



10. Steam comes into the steam radiators at a temperature of 

 100 C. and the water of the condensed steam flows from the radiator 

 at about the same temperature; where does the heat that warms 

 the room come from? 



11. How much heat will the air in a room receive from a radiator 

 in 12 hours if 10,000 grams of steam at a temperature of 100 C. 

 come into the radiator each hour, and if water flows out of the 

 radiator at a temperature of 95 C? 



12. If boiling-hot food is placed in a fireless cooker, will the 

 temperature of the food increase or decrease? Why? Will it cook? 

 Why? Why will the flavor of food thus cooked be increased? 



