I.4.2. Body

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The body represents the portion of matter with its own shape and its own volume (well determined).

Examples of bodies: human body, table, chair, house, glass of milk, etc.

Bodies are made up of matter with:

• Homogeneous composition throughout its own mass which are called substances (examples: metals, water, oxygen, carbon dioxide, diamond, kitchen salt, bruised stone, nitrogen, etc.).
• Heterogeneous (which is not the same) composition which are called materials. For example: wood (contains cellulose, lignin, water), paper (cellulose), cement, concrete, porcelain, granite, plastics, glass, etc.).