Publisher's Synopsis
Excerpt from Elements of Chemical Physics
Physical and Chemical properties.corresponding to the two classes of changes above described are two classes of properties, into which we may divide the specific properties of a substance. Those properties which a substance may manifest without undergoing any essential change itself, or causing any essential changes in other substances, are generally called Phys ical Properties. On the other hand, those properties which re late essentially to its action on other substances, and to the permanent changes which it either experiences in itself, or which it effects upon them, f are called Chemical Properties. Thus, among the physical properties of iron we should include its great tenacity and malleability, its specific gravity, its peculiar lustre, its great infusibility, the facility with which it may be forged at a high temperature, its power of transmitting electricity and of assuming magnetic polarity. Among its chemical properties, on the other hand, we should enumerate the ease with which it rusts in the air, the readiness with which it dissolves in dilute acids, its combustibility in oxygen gas, and many others. This last class of properties evidently cannot be manifested by iron with out its losing its essential properties and ceasing to be iron. The first class, on the other hand, do not involve any such radi cal changes.
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