l>Lesson I: The Metric System and also SI Units  A meter is 3.37 inches much more than a yard.

You are watching: Which of the following is not an advantage of using the metric system? A liter is 1.82 fluid ounces much more than a quart. A dime weighs about one gram.
IntroductionThe metric mechanism is the wanted system of scientific units for several reasons:The majority of nations in the people employ the metric system of measurement.The prefixes attached to metric units lug the same definition for all base units.The metric mechanism is based upon strength of ten, i m sorry is convenient because:A measure up in the metric mechanism that is represented by a reasonable number stays a rational numberafter metric unit conversion. (For example, 250 mm = 25 cm = .25 m). In contrast irrational unit systems, such as the English system, execute not have actually the same home (For example, 250 inch = 20.8333... Ft = 0.0039457... Mile)Because metric units space decimal-based, they are quickly converted by moving the decimal point.The terms mass and weight are frequently used interchangebly in chemistry. Strictly speaking, load is the force (F) connected with a given mass (m) as it is increased (a) through gravity: F = m × aThe English system unit of mass is the slug, which when multiplied by the acceleration of heaviness (32 ft/sec2) gives the weight in pounds.Length
 Metric base UnitsThe metric system uses the complying with base units:Unit that MeasurementNameAbbreviation Meter m Mass Gram g Volume Liter L
Frequently the above units space too small or more often too big to accordingly scale the measure up quantity. It is then necessary to subdivide or expand our measurement unit. This will certainly be debated in the ar on prefixes.

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 The liter is not the SI unit the volume Volume is a unit obtained from length. The volume (V) of a cube that has actually length (l) = 1.0 cm, broad (w) = 1.0 cm, and height (h) is given by:V = together × w × h = 1.0 cm × 1.0 centimeter × 1.0 cm= 1.0 cm3By definition, 1.0 cm3 = 1.0 mL  It complies with from dimensional evaluation that 1.0 dm3 = 1.0 L.SI Units
The metric-based Système global or SI devices are used to standardize the report or calculate of scientific quantities:Physical QuantityName of UnitAbbreviationLength
Meterm
MassKilogramkg
TemperatureKelvinK
TimeSeconds
Amount of SubstanceMolemolElectric CurrentAmpereILuminous IntensityLumenIv
The SI systems are used to build all other units (these are called acquired units
). Some examples:PropertySymbolDimensionsName
Velocityvm · s-1
AreaAm2
Frequencyvs-1Hertz (Hz)
ForceFkg · m · s-2Newton (N)
EnergyEkg · m2 · s-2Joule (J)
Exa- Outside the joined States, the word "meter" is assignment "metre" and the word "liter" is order "litre." Metric PrefixesTo change the scale of the base units, prefixes are attached. A prefix represents a factor whereby the base unit have to be multiplied. Metric prefixes are noted below (The prefixes most-commonly used in chemistry are listed in red):PrefixSymbolDecimalValuePower of Ten E 1,000,000,000,000,000,000 1018 Peta- P 1,000,000,000,000,000 1015 Tera- T 1,000,000,000,000 1012 Giga- G 1,000,000,000 109 Mega- M 1,000,000 106 Kilo- k 1,000 103 Hecto- h 100 102 Deka- da 10 101 (no prefix) 1 100 Deci- d 0 .1 10-1 Centi- c 0 .01 10-2 Milli- m 0 .001 10-3 Micro- µ 0 .000001 10-6 Nano- n 0 .000000001 10-9 Pico- p 0 .000000000001 10-12 Femto- f 0 .000000000000001 10-15 Atto- a 0 .000000000000000001 10-18
 In addition to the basic metric units, numerous other scientific quantities additionally employ this mechanism of prefixes: 1 Mb = 1 Megabyte = 1 × 106 byte 1 Food Calorie = 1 kcal= 1 kilocalorie = 1 × 103 calorie 1 ns = 1 nanosecond = 1 × 10-9 second 1 pf = 1 picofarad = 1 × 10-12 farad 1 kWH = 1 kiloWatt·hour = 1 × 103 Watt·hour
The metric prefixes deserve to be employed to scale the base units so that they have the right to represent anything from a very huge numeric worth (for example by using prefixes such together Exa, Tera, or Mega) come a very small numeric worth (for exampleby using prefixes such as Atto, Femto, or Pico). Scaling the unit up or down when reporting dimensions is good practice because:It have the right to be used to store the numeric worth of dimensions to reasonably-sized numbers, say between values that 0.01 come 100.It have the right to be supplied to eliminate ambiguous place-holding zeroes in measurments, so the the number of significant figures are appropriately represented.The prefixes instantly convey how many decimal place moves are compelled of the numeric value. Because that example, utilizing the clinical notation value of the metric prefixes):1 centimeter = 1 centimeter = 1 × 10-2 meter = 0.01 meter1 kg = 1 kilogram = 1 × 103 gram = 1000 gram1 µL= 1 microliter = 1 × 10-6 liter = 0.000001 literFor further explanation that unit interconversion utilizing the metric prefixes as conversion factors, visit the dimensional analysis page. In addition to the typical metric prefixes, the Ångstrom is also a commonly used unit that arises in dimensions on the atom scale:1 Ångstrom = 1 Å = 1 × 10-10 meter
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