Quotation from: General Science

Written by: Bertha M. Clark


From a ton of good gas-producing coal can be obtained about 10,000
cubic feet of illuminating gas, and as by-products 6 pounds of
ammonia, 12 gallons of coal tar, and 1300 pounds of coke.


147. Natural Gas. Animal and vegetable matter buried in the depth of
the earth sometimes undergoes natural distillation, and as a result
gas is formed. The gas produced in this way is called natural gas. It
is a cheap source of illumination, but is found in relatively few
localities and only in limited quantity.

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