Hydrogen

An element existing under all except the most extreme artificial conditions of pre ure and cold as a gas. It is the lightest of known substances. Atomic weight, 1; molecular weight, 2; equivalent, 1; valency, 1; specific gravity,.0691-.0695. (Dumas & Bou ingault.) It is a dielectric of about the same resistance as air. Its specific inductive capacity at atmospheric pre ure is: .9997 (Baltzman)  .9998 (Ayrton) Electro-chemical equivalent,.0105 milligram. The above is usually taken as correct. Other values are as follows: .010521 (Kohllrausch)  .010415 (Mascart) The electro-chemical equivalent of any element is obtained by multiplying its equivalent by the electro-chemical equivalent of hydrogen. The value.0105 has been used throughout this book.