Questions and Answers

Issue 2 and Volume 93.

Questions and Answers NOTE—Readers are invited to send in questions, which will be answered in the order received. Names are omitted from questions unless otherwise specified Good and Bad Conductivity To the Editor: How does the word “good” and the word “bad” apply with reference to the subject of conductivity? What is the relation of pulverized substances in this respect? The relation of oils, etc.? D. A. L. Answer: Conductivity is the quantity of heat transmitted through a unit thickness of material per unit of area in a unit of time, in the system that is employed in this country, the conductivity is usually expressed in B.t.u. per hour per square foot per inch of thickness. The terms “good” and “poor” conductors are relative terms. There is no distinct line of demarcation between them. For example, we say that iron is a good conductor of heat whereas wood is a…

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