| Term | Definition |
|---|
| face | the flat surface of a three-dimensional figure |
| edge | the line segment where two faces of a three-dimensional figure meet |
| length | the measure of a line segment, or one side or edge of a figure |
| volume | the measure of the amount of space occupied by an object |
| cubic unit | a unit for measuring volume such as a cubic inch or cubic centimeter. It is the volume of a cube with 1-unit edges |
| rectangular prism | a prism with congruent rectangular bases |
| area | the amount of surface covered or enclosed by a figure measured in square units |
| one-dimensional | having only length as a measure. A line segment is this. |
| two-dimensional | having length measurements in two directions, perpendicular to each other (length, width) |
| three-dimensional | having length measurements in three directions, perpendicular to one another (length, width, height) |
| capacity | a measure of how much a container can hold, also used to describe the volume of fluids such as water or sand |
| liter | the basic unit of capacity in the metric system |
| milliliter | a metric unit of capacity equal to 0.001 liter |
| kilometer | a unit of capacity equal to 1,000 meters |
| mass | the amount of matter in an object. It is constant; weight varies because it is subject to the effect of gravity on matter. |
| kilogram | a unit of mass equal to 1,000 grams |
| gram | the basic unit of mass in the metric system. A nickel weighs about 5 of these. |
| milligram | a metric unit of mass equal to 0.001 gram. |
| ounce | a unit of weight or capacity in the U.S. customary system equal to 1/16 of a pound or 1/8 of a cup |
| pound | a U.S. customary unit for measuring mass. One is equal to sixteen ounces. |
| ton | a customary unit for measuring mass. One is equal to 2,000 pounds. |
| gallon | a U.S. customary unit for measuring capacity. One of these is equal to 4 quarts. |
| quart | a U.S. customary unit for measuring capacity. One is equal to 32 ounces, 4 cups, 2 pints. |
| pint | a U.S. customary unit for measuring capacity. One is equal to two cups or half a quart. |
| cup | a customary unit for measuring capacity. There are 2 of these in a pint. |
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