- Measurement is defined as the act of measuring or the size of something.
- An example of measurement means the use of a ruler to determine the length of a piece of paper.
- An example of measurement is 15" by 25".

Getting the measurement of this paper.

## measurement

noun

- a measuring or being measured; mensuration
- extent, quality, or size as determined by measuring; dimension: a waist
*measurement*of 32 inches - a system of measuring or of measures

## measurement

noun

- The act of measuring or the process of being measured.
- A system of measuring:
*measurement in miles.* - The dimension, quantity, or capacity determined by measuring:
*the measurements of a room.*

## CONVERSION BETWEEN METRIC AND U.S. CUSTOMARY UNITS

### FROM U.S. CUSTOMARY TO METRIC

When You Know | Multiply By | To Find |
---|---|---|

inches | 25.4 | millimeters |

2.54 | centimeters | |

feet | 30.48 | centimeters |

yards | 0.91 | meters |

miles | 1.61 | kilometers |

teaspoons | 4.93 | milliliters |

tablespoons | 14.79 | milliliters |

fluid ounces | 29.57 | milliliters |

cups | 0.24 | liters |

pints (liquid) | 0.47 | liters (liquid) |

quarts (liquid) | 0.95 | liters (liquid) |

gallons | 3.79 | liters |

cubic feet | 0.028 | cubic meters |

cubic yards | 0.76 | cubic meters |

ounces | 28.35 | grams |

pounds | 0.45 | kilograms |

short tons (2,000 lbs) | 0.91 | metric tons |

square inches | 6.45 | square centimeters |

square feet | 0.09 | square meters |

square yards | 0.84 | square meters |

square miles | 2.59 | square kilometers |

acres | 0.40 | hectares |

### FROM METRIC TO U.S. CUSTOMARY

When You Know | Multiply By | To Find |
---|---|---|

millimeters | 0.04 | inches |

centimeters | 0.39 | inches |

meters | 3.28 | feet |

1.09 | yards | |

kilometers | 0.62 | miles |

milliliters | 0.20 | teaspoons |

0.07 | tablespoons | |

0.03 | fluid ounces | |

liters (liquid) | 1.06 | quarts (liquid) |

0.26 | gallons | |

4.23 | cups | |

2.12 | pints (liquid) | |

cubic meters | 35.31 | cubic feet |

1.35 | cubic yards | |

grams | 0.035 | ounces |

kilograms | 2.20 | pounds |

metric tons (1,000 kg) | 1.10 | short tons |

square centimeters | 0.155 | square inches |

square meters | 1.20 | square yards |

square kilometers | 0.39 | square miles |

hectares | 2.47 | acres |

### TEMPERATURE CONVERSION BETWEEN CELSIUS AND FAHRENHEIT

°C = (°F - 32) ÷ 1.8 |

°F = (°C × 1.8) + 32 |

## UNITS OF THE INTERNATIONAL SYSTEM

The International System (abbreviated SI, for Système International, the French name for the system) was adopted in 1960 by the 11th General Conference on Weights and Measures. An expanded and modified version of the metric system, the International System addresses the needs of modern science for additional and more accurate units of measurement. The key features of the International System are decimalization, a system of prefixes, and a standard defined in terms of an invariable physical measure.

### BASE UNITS

The International System has base units from which all others in the system are derived. The standards for the base units, except for the kilogram, are defined by unchanging and reproducible physical occurences. For example, the meter is defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second. The standard for the kilogram is a platinum-iridium cylinder kept at the International Bureau of Weights and Standards in Sèvres, France.

Unit | Quantity | Symbol |
---|---|---|

meter | length | m |

kilogram | mass | kg |

second | time | s |

ampere | electric current | A |

kelvin | temperature | K |

mole | amount of matter | mol |

candela | luminous intensity | cd |

### PREFIXES

A multiple of a unit in the International System is formed by adding a prefix to the name of that unit. The prefixes change the magnitude of the unit by orders of ten from 1024 to 10-24.

Prefix | Symbol | Multiplying Factor |
---|---|---|

yotta- | Y | 1024 = 1,000,000,000,000,000,000,000,000 |

zetta- | Z | 1021 = 1,000,000,000,000,000,000,000 |

exa- | E | 1018 = 1,000,000,000,000,000,000 |

peta- | P | 1015 = 1,000,000,000,000,000 |

tera- | T | 1012 = 1,000,000,000,000 |

giga- | G | 109 = 1,000,000,000 |

mega- | M | 106 = 1,000,000 |

kilo- | k | 103 = 1,000 |

hecto- | h | 102 = 100 |

deca- | da | 10 = 10 |

deci- | d | 10-1 = 0.1 |

centi- | c | 10-2 = 0.01 |

milli- | m | 10-3 = 0.001 |

micro- | µ | 10-6 = 0.000,001 |

nano- | n | 10-9 = 0.000,000,001 |

pico- | p | 10-12 = 0.000,000,000,001 |

femto- | f | 10-15 = 0.000,000,000,000,001 |

atto- | a | 10-18 = 0.000,000,000,000,000,001 |

zepto- | z | 10-21 = 0.000,000,000,000,000,000,001 |

yocto- | y | 10-24 = 0.000,000,000,000,000,000,000,001 |

### DERIVED UNITS

Most of the units in the International System are derived units, that is units defined in terms of base units and supplementary units. Derived units can be divided into two groups—those that have a special name and symbol, and those that do not.

WITHOUT NAMES AND SYMBOLS | |
---|---|

Measure of | Derivation |

acceleration | m/s2 |

angular acceleration | rad/s2 |

angular velocity | rad/s |

density | kg/m3 |

electric field strength | V/m |

luminance | cd/m2 |

magnetic field strength | A/m |

velocity | m/s |

WITH NAMES AND SYMBOLS | |||
---|---|---|---|

Unit | Measure of | Symbol | Derivation |

coulomb | electric charge | C | A·s |

farad | electric capacitance | F | A·s/V |

henry | inductance | H | V·s/A |

hertz | frequency | Hz | cycles/s |

joule | quantity of energy | J | N·m |

lumen | flux of light | lm | cd·sr |

lux | illumination | lx | lm/m2 |

newton | force | N | kg·m/s2 |

ohm | electric resistance | &OHgr; | V/A |

pascal | pressure | Pa | N/m2 |

tesla | magnetic flux density | T | Wb/m2 |

volt | voltage | V | W/A |

watt | power | W | J/s |

weber | magnetic flux | Wb | V·s |

Copyright ©rt; 2011 by Houghton Mifflin Harcourt Publishing Company

## measurement

See also instruments.

**acetimetry**the measurement of the relative amount of acetic acid in a given subtance.

**—acetimetrical**, adj. acidimetry Chemistry. the determination of the amount of free acid in a liquid.

**—acidimeter**, n.

**—acidimetrical**, adj. algometry measurement of pain by means of an algometer.

**atmidometry**the measurement of evaporation in the air.

**—atmidometer**, n.

**autometry**

**1.**the measurement of oneself.

**2.**the measurement of a part of a figure as a fraction of the total figure’s height.

**—autometric**, adj.

**baculometry**the measurement of distance or lines by means of a stave or staff.

**chorometry**the science of land surveying.

**chronoscopy**accurate measurement of short intervals of time by means of a chronoscope.

**—chronoscopic**, adj.

**cosmometry**the science of measuring the universe.

**cryometry**the measurement of extremely low temperatures, by means of a cryometer.

**cyclometry**the measurement of circles. dosimetry the measurement by a dosimeter of the dosage of radiation a per-son has received. See also drugs.

**—dosimetrist**, n.

**—dosimetric, dosimetrical**, adj.

**erythrocytometry**measurement of the red blood cells in the blood, by use of an erythrocytometer. eudiometry the science of measuring and analyzing gases by means of a eudiometer. fluorometry the measurement of fluorescence, or visible radiation, by means of a fluorometer.

**—fluorometric**, adj. galvanometry the measurement of the strength of electric currents, by means of a galvanometer.

**—galvanometric, galvanometrical**, adj. gasometry the measurement of the amounts of the gases in a mixture.

**—gasometer**, n.

**—gasometric, gasometrical**, adj. goniometry the practice or theory of measuring angles, especially by means of a goniometer.

**halometry**the measurement of the dimensions and angles of the planes of salt crystals.

**—halometer**, n.

**heliometry**the practice of measuring the angular distance between stars by means of a heliometer.

**—heliometric, heliometrical**, adj.

**horometry**the art or science of measuring time.

**—horometrical**, adj. hypsometry the measurement of altitude and heights, especially with refer-ence to sea level.

**—hypsometric, hypsometrical**, adj.

**indigometry**the practice and art of determining the strength and coloring power of an indigo solution. isometry equality of measure.

**—isometric, isometrical**, adj.

**konimetry**the measurement of impurities in the air by means of a konimeter.

**—konimetric**, adj. kymography

**1.**the measuring and recording of variations in fluid pressure, as blood pressure.

**2.**the measuring and recording of the angular oscillations of an aircraft in flight, with respect to an axis or axes flxed in space.

**—kymograph**, n.

**—kymographic**, adj.

**megameter**Rare. an instrument for measuring large objects. See also geography. mensuration

**1.**the act, process, or science of measurement.

**2.**the branch of geometry dealing with measurement of length, area, or volume.

**—mensurate, mensurational**, adj. metrology the study and science of measures and weights.

**—metrologist**, n.

**—metrological**, adj.

**osmometry**the measurement of osmotic pressure, or the force a dissolved substance exerts on a semipermeable membrane through which it cannot pass when separated by it from a pure solvent.

**—osmometric**, adj.

**osteometry**the measurement of bones.

**oxidimetry**the determination or estimation of the quantity of oxide formed on a substance.

**—oxidimetric**, adj.

**pantometry**Obsolete, the realm of geometrical measurements, taken as a whole.

**—pantometer**, n.

**—pantometric, pantometrical**, adj. piezometry the measurement of pressure or compressibility, as with a piezometer.

**—piezometric**, adj.

**plastometry**the measurement of the plasticity of materials, as with a plastometer.

**—plastometric**, adj.

**pulmometry**the measurement of the capacity of the lungs.

**—pulmometer**, n. pyrometry the measurement of temperatures greater than 1500 degrees Celsius.

**—pyrometer**, n.

**—pyrometric, pyrometrical**, adj. radiometry the measurement of radiant energy by means of a radiometer.

**—radiometric**, adj. rheometry the measurement of electric current, usually with a galvanometer.

**—rheometric**, adj. stadia a means of surveying in which distances are measured by reading intervals on a graduated rod intercepted by two parallel cross hairs in the telescope of a surveying instrument.

**—stadia**, adj. stereometry

**1.**the process of determining the volume and dimensions of a solid.

**2.**the process of determining the specific gravity of a liquid.

**—stereometric**, adj. tachymetry the measurement of distance, height, elevation, etc., with a tachymeter. telemetry the science or use of the telemeter; long-distance measurement. turbidimetry the measurement of the turbidity of water or other fluids, as with a turbidimeter.

**—turbidimetric**, adj. urinometry measurement of the specific gravity of urine, by means of an urinometer.

**volumenometry**the measurement of the volume of a solid body by means of a volumenometer.

**volumetry**the measurement of the volume of solids, gases, or liquids; volumetric analysis.

**—volumetric, volumetrical**, adj. zoometry the measurement and comparison of the sizes of animals and their parts.

**—zoometric**, adj.

## measurement

(*plural* measurements)

- The act of measuring.
- Magnitude (extent or amount) determined by measurement.