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单词 measurement
释义
meas·ure·ment (mĕzhər-mənt)
n.
1. The act of measuring or the process of being measured.
2. A system of measuring: measurement in miles.
3. 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 KnowMultiply ByTo Findinches25.4millimeters 2.54centimetersfeet30.48centimetersyards0.91metersmiles1.61kilometersteaspoons4.93milliliterstablespoons14.79millilitersfluid ounces29.57milliliterscups0.24literspints (liquid)0.47liters (liquid)quarts (liquid)0.95liters (liquid)gallons3.79literscubic feet0.028cubic meterscubic yards0.76cubic metersounces28.35gramspounds0.45kilogramsshort tons (2,000 lbs)0.91metric tonssquare inches6.45square centimeterssquare feet0.09square meterssquare yards0.84square meterssquare miles2.59square kilometersacres0.40hectares

FROM METRIC TO U.S. CUSTOMARY

When You KnowMultiply ByTo Findmillimeters0.04inchescentimeters0.39inchesmeters3.28feet 1.09yardskilometers0.62milesmilliliters0.20teaspoons 0.07tablespoons 0.03fluid ouncesliters (liquid)1.06quarts (liquid) 0.26gallons 4.23cups 2.12pints (liquid)cubic meters35.31cubic feet 1.35cubic yardsgrams0.035ounceskilograms2.20poundsmetric tons (1,000 kg)1.10short tonssquare centimeters0.155square inchessquare meters1.20square yardssquare kilometers0.39square mileshectares2.47acres

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.

UnitQuantity Symbolmeter length mkilogram mass kgsecond time sampere electric current Akelvin temperature Kmole amount of matter molcandela 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.

PrefixSymbolMultiplying Factoryotta- Y 1024 = 1,000,000,000,000,000,000,000,000zetta- Z 1021 = 1,000,000,000,000,000,000,000exa- E 1018 = 1,000,000,000,000,000,000peta- P1015 = 1,000,000,000,000,000tera- T 1012 = 1,000,000,000,000giga- G 109 = 1,000,000,000mega- M 106 = 1,000,000kilo- k 103 = 1,000hecto- h 102 = 100deca- da 10 = 10deci- d 10-1 = 0.1centi- c 10-2 = 0.01milli- m 10-3 = 0.001micro- μ10-6 = 0.000,001nano- n 10-9 = 0.000,000,001pico- p 10-12 = 0.000,000,000,001femto- f 10-15 = 0.000,000,000,000,001atto- a 10-18 = 0.000,000,000,000,000,001zepto- z 10-21 = 0.000,000,000,000,000,000,001yocto- 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 SYMBOLSMeasure ofDerivationacceleration m/s2angular acceleration rad/s2angular velocity rad/sdensity kg/m3electric field strength V/mluminance cd/m2magnetic field strength A/mvelocity m/s
WITH NAMES AND SYMBOLSUnitMeasure ofSymbolDerivationcoulomb electric charge C A·sfarad electric capacitance F A·s/Vhenry inductance H V·s/Ahertz frequency Hz cycles/sjoule quantity of energy J N·mlumen flux of light lm cd·srlux illumination lx lm/m2newton force N kg·m/s2ohm electric resistance ΩV/Apascal pressure Pa N/m2tesla magnetic flux density T Wb/m2volt voltage V W/Awatt power W J/sweber magnetic flux Wb V·s

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更新时间：2025/1/23 12:24:40