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| Terms | Definition |
|---|---|
| metric system | decimal system of units based on the meter as a unit length,the kilogram as a unit mass, and the second as a unit time |
| length | the distance between two points |
| mass | the amount of matter contained in an object |
| volume | the space matter occupies |
| meter | metric standerd for line measure; unit of distance |
| liter | basic unit of volume |
| gram | unit of mass |
| weight | force created by the response of mass to pull of gravity; measure of heaviness of an object |
| gravity | nature force of attraction between any two massive bodies, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them |
| scale | instrument that measures weight |