In chemistry, a chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e. without breaking chemical bonds. It can be solid, liquid, gas, or plasma. Chemical substances are often called ‘pure’ to set them apart from mixtures.
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When to train to increase life longevity
Few will argue about the importance of exercise to increase life longevity. But about the best time of day for them, opinions differ. Coach Deanna Hammond-Blackburn believes that it is best to...
Heartburn can be a manifestation of a fatal illness
American scientists conducted a study that showed that gastroesophageal reflux disease, one of the manifestations of which is heartburn, is associated with a high risk of developing cancer of the larynx and...