4. Make a cross-section sketch of your living room and indicate the convection currents by which the room is heated. Explain the heating of the room.
5. Make a sketch showing how the water in the hot-water tank in the kitchen or laundry is heated. Explain your sketch, indicating convection currents.
6. Is it economical to keep stoves and radiators highly polished? Explain.
7. If you open the door between a warm and a cool room what will be the direction of the air currents at the top and at the bottom of the door? Explain.
8. If a hot-water heating system contains 100 cu. ft. of water how much heat will be required to raise its temperature 150°F.?
9. Why does a tall chimney give a better draft than a short one?
10. Explain how your school room is heated and ventilated.
11. Should a steam or hot-water radiator be placed near the floor or near the ceiling of a room? Why?
12. In a hot-water heating system an open tank connected with the pipes is placed in the attic or above the highest radiator. Explain its use.