Chemistry is the science of the internal structure of the substances and related properties as well as the substance changes that may be the result of altered external conditions, such as contact with other substances or altered pressure and temperature.

The subject is about the part of the chemistry that is relevant to biological systems, thus forming a scientific foundation for many other subjects such as cell biology, biochemistry, biophysics, physiology, pharmacology and clinical biochemistry.

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In nothing do men more nearly approach the gods than in giving health to men.

— Cicero