# General Knowledge - Measurements

The following table explains the metric units and their measurements −

Term Symbol value
yotta Y 1024
zetta Z 1021
exa E 1018
peta P 1015
tera T 1012
giga G 109
mega M 106
kilo k 103
hecto h 102
deka da 101
deci d 10-1
centi c 10-2
milli m 10-3
micro μ 10-4
nano n 10-9
pico p 10-12
femto f 10-15
atto a 10-18
zepto z 10-21
yocto y 10-24

## Units of Length

Units Measurement
10 millimeters (mm) = 1 centimeter (cm)
10 centimeters = 1 decimeter (dm)
10 decimeters = 1 meter (m)
10 meters = 1 dekameter
10 dekameters = 1 hectometer
10 hectometers = 1 kilometer

## Units of Area

Units Measurement
100 square millimeters (mm2) = 1 square centimeter (cm2)
100 square centimeters = square decimeter (dm2)
100 square decimeters = quare meter (m2)
100 square meters = 1 square dekameter (dam2)
100 square dekameters = 1 square hectometer (hm2)
100 square hectometers = 1 square kilometer (km2)

## Units of Liquid Volume

Units Measurement
10 milliliters (mL) = 1 centiliter (cL)
10 centiliters = 1 deciliter (dL) = 100 milliliters
10 deciliters = 1 liter1 = 1000 milliliters
10 liters = 1 dekaliter (daL)
10 dekaliters = 1 hectoliter (hL) = 100 liters
10 hectoliters = 1 kiloliter (kL) = 1000 liters

## Units of Volume

Units Measurement
1000 cubic millimeters (mm3) = 1 cubic centimeter (cm3)
1000 cubic centimeters = 1 cubic decimeter (dm3)
1000 cubic decimeters = 1 cubic meter (m3)

## Units of Mass

Units Measurement
10 milligrams (mg) = 1 centigram (cg)
10 centigrams = 1 decigram (dg)
10 decigrams = 1 gram (g)
10 grams = 1 dekagram (dag)
10 dekagrams = 1 hectogram (hg)
10 hectograms = 1 kilogram (kg)
1000 kilograms = 1 megagram (Mg) or 1 metric ton(t)

## Units of Length (Area)

Units Measurement
12 inches (in) = 1 foot (ft)
3 feet = 1 yard (yd)
16½ feet = 1 rod (rd), pole, or perch
40 rods = 1 furlong (fur) = 660 feet
8 furlongs = 1 U.S. statute mile (mi) = 5280 feet
1852 meters (m) = 1 international nautical mile

## International System of Units

Unit Name Symbol Quantity
meter m Length
kilogram kg Mass
second s Time
ampere A Electric Current
kelvin K Thermodynamic temperature
mole mol Amount of substance
candela cd Luminous intensity
hertz Hz Frequency
newton N Force, weight
pascal Pa pressure, stress
joule J energy, work, heat
coulomb C Electric charge
volt V Voltage, electromotive force
ohm Electric resistance
tesla T Magnetic flux density
degree Celsius 0C Temperature
henry H Magnetic induction
Angstrom Å Wave length

## Conversion of Units

Unit I Value in another unit
1 Inch 2.54 centimeter
1 Foot 0.3048 meter
1 Foot 30.48 centimeter
1 Yard 0.9144 meter
1 Mile 1609.34 meter
1 Chain 20.1168 meter
1 Nautical mile 1.852 kilometer
1 Angstrom 10-10 meter
1 Square inch 6.4516 square centimeter
1 Acre 4046.86 square meter
1 grain 64.8 milligram
1 dram 1.77 gm
1 ounce 28.35 gm
1 pound 453.592 gram
1 horse power 735.499 Watt