a) Why does water in a metal canteen stay cooler if the cloth jacket surrounding the canteen is kept moist?
b) Does an ordinary electric fan cool the air? why or why not?.if not why utilize it?
c) When a hot-air furnace is used to heat a house, why is it significant that there be a vent for air to return to the furnace? What happens if this vent is blocked by a bookcase?
d) Micros processor chip have a "heat sink" glued on top that looks like a series of fins, why is it shaped like that?