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Matter

The definition of chemistry - the study of the interactions of matter with other matter and with energy - uses some terms that should also be defined. We start the study of chemistry by defining some basic terms.

Matter is anything that has mass and takes up space. A book is matter, a computer is matter, food is matter, and dirt in the ground is matter. Sometimes matter may be difficult to identify. For example, air is matter, but because it is so thin compared to other matter (e.g., a book, a computer, food, and dirt), we sometimes forget that air has mass and takes up space. Things that are not matter include thoughts, ideas, emotions, and hopes.

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