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| Term | Definition |
|---|---|
| metric system | decimal system of units based on the meter as a yunit lenght, the kilogram as a unit mass, and the second as a unit time |
| length | the distance between two points |
| mass | the measure of the quantity of matter that a body or an object contains |
| volume | amount of space occupied by a three-dimensional object or region of space |
| meter | (m) metric standard for line measure; unit of distance |
| liter | basic unit of volume |
| gram | unit of mass |
| weight | force created by the response of mass to the pull of gravity; measure of the heaviness of an object |
| gravity | natural force of attraction between any two massive bodies which is directly proportional to the product of their masses and inversly proportional to the square of the distance between them |
| scale | instrumen used to measure weight |