# Volume, Capacity, Mass, & Weight

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Unit C

### 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

### kiloliter

a unit of capacity equal to 1,000 liters

### 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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