A. Because this paste is a very bad conductor of heat; and, therefore, prevents the escape of heat from the furnace.
Q. If a stove be placed in the middle of a room, should it be made of bricks or iron?
A. A stove in the middle of a room should be made of iron; because iron is an excellent conductor, and rapidly communicates its heat to the air around.
Q. Why does the Bible say, that God “giveth snow like wool?”
A. As snow is a very bad conductor of heat, it protects vegetables and seeds from the frost and cold.
Q. How does the non-conducting power of snow protect vegetables from the frost and cold?
A. As snow is a bad conductor, it prevents the heat of the earth from being drawn off by the cold air which rests upon it.
Q. Why are woollens and furs used in cold weather for clothing?
A. Because they are very bad conductors of heat; and, therefore, prevent the warmth of the body from being drawn off by the cold air.
Q. Do not woollens and furs actually impart heat to the body?