Deals with the study of matter and energy

Physical chemists study how matter and energy interact. Food science deals with the three biological components of food — carbohydrates.
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While this simple definition is easily applied, the way people view matter is often broken down into two characteristic length scales: the macroscopic and the microscopic.


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Matter is anything that has mass and volume takes up space. For most common objects that we deal with every day, it is fairly simple to demonstrate that they have mass and take up space.

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You might be able to imagine, however, the difficulty for people several hundred years ago to demonstrate that air has mass and volume. Air and all other gases are invisible to the eye, have very small masses compared to equal amounts of solids and liquids, and are quite easy to compress change volume. Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume 3. Matter can be classified into two broad categories: pure substances and mixtures.

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Chapter 3 Matter and Energy

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