Units Topics

A
The abbreviation of Ampere, the SI unit of Electric current.
A
The Ångström is an old unit used for measuring the wavelength of electromagnetic radiation including visible light and X-rays.
aA
Abbreviation of abampere.
ab
A prefix indicating that an electrical unit is part of the CGS absolute electromagnetic system.
Abampere
The CGS electromagnetic unit of current equal to 10 Amperes.
Abcoulomb
The CGS unit of electric charge equal to 10 Coulomb.
Abfarad
The CGS unit of capacitance equal to 1.0x109Farad.
Abhenry
The CGS unit of inductance equal to 1.0x10-9Henry.
Abmho
The CGS unit that is the reciprocal of the ohm equal to 1.0x109Siemens.
Abohm
The CGS unit of electrical resistance equal to 1.0x10-9Ohms.
Absolute System of Units
A system of units in which a small number of units are chosen as fundamental, and all other units are derived from them.
Absolute Unit
A unit defined in terms of fundamental quantities.
abtesla
The CGS unit of magnetic flux density equal to 10-4 tesla.
abv
Abbreviation of Alcohol by Volume.
Abvolt
The CGS unit of electromotive force equal to 1.0x10-9Volt.
abw
Abbreviation of Alcohol by Weight.
abwatt
The CGS unit of power equal to 10-7 watt.
abweber
The CGS unit of magnetic flux equal to 10-8 weber. Also known as the maxwell.
ac ft
Abbreviation of acre foot, a volume one foot deep covering an area of one acre.
Acoustic Ohm
The unit of acoustic impedance.
Acre
A British unit of area, traditionally used in agriculture.
Acre Foot
A volume one foot deep covering an area of one acre.
Acre Inch
A volume one inch deep covering an area of one acre.
Aeon
In astronomical terms, 1,000 million years.
Ah
Abbreviation of ampere-hour.
Alcohol by Volume
A standard measure of how much alcohol is contained in an alcoholic beverage, expressed as a percentage of total volume.
Alcohol by Weight
A measure of how much alcohol is in a beverage, expressed as a percentage of the total beverage weight.
amp
The informal name for Ampere.
Ampere
The SI unit of Electric current.
Ampere-Hour
An alternative unit of electrical charge.
AMU
Defined as one twelfth of the mass of the most abundant isotope of carbon (12C)
Angstrom Star
Unit used to measure the wavelength of X-rays.
Angular Speed
The rate of change of angle turned in radians.
Apothecaries Ounce
Once used as a measurement of weight for drugs and other medical substances.
Approximate
Lists all Approximate topics in the Encyclopaedia
Are
A derived SI Unit of area. 1 Are = 100m2
Area
The derived SI unit of area is the m2.
Areal Weight
The weight of fibre per unit area, width times length, of tape or fabric.
at
Abbreviation for Technical Atmosphere.
atm
An abbreviation of atmosphere.
atmo-m
Abbreviation of atmo-metre.
atmo-metre
Unit used in atmospheric physics to compare the "depth" or total volume of atmospheres, or components of atmospheres.
Atomic Time Scale
A time scale based on an atomic definition of the second.
Atomic Unit
A system of non-SI units used in quantum chemistry to simplify calculations and mathematical expressions.
Attometre
A distance of 10-18m.
Bank Cubic Metre
Represents the contents of a cubic metre of rock in place, before it is drilled and blasted.
bar
A derived unit of pressure used in meteorology. 1 bar = 1x105 Pa.
Bar Litre
Unit of energy used to measure the potential energy of gases under pressure.
barg
An abbreviation for bar gauge.
Barn
A unit of nuclear cross section, 1 Barn = 10-28m2.
Barrel
A unit of capacity in the oil industry.
Barrel Bulk
Commercial unit of volume equal to exactly 5 cubic feet or 0.141 584 cubic metres.
Barrel of Oil Equivalent
A unit of energy equal to approximately 6.1 gigajoules.
Barye
The CGS unit of pressure, equal to 1 dyne per square centimetre.
Base Unit
Base units are units that are fundamental building blocks in a system of measurement.
Bcfe
Abbreviation of Billion Cubic Feet of Gas Equivalent.
BCM
Abbreviation of Bank Cubic Metre.
Becquerel
The Becquerel is a unit used to measure a radioactivity. One Becquerel is that quantity of a radioactive material that will have 1 transformations in one second.
Billion Cubic Feet of Gas Equivalent
This is really an energy unit equal to about 1.091 petajoules (PJ).
Blink
A unit of time equal to 0.864 second. This unit is also called the metric second.
Blondel
Another name for an Apostlib.
BMI
Abbreviation of Body Mass Index.
Board Foot
A unit of lumber volume, a rectangular solid nominally 12" x 12" x 1". The equivalent of a board 1-foot square and 1 inch thick.
Body Mass Index
A measure of fatness used in medicine and health.
boe
Abbreviation of Barrel of Oil Equivalent.
British Thermal Unit
The amount of heat required to raise the temperature of 1 pound of water by 1° Fahrenheit.
Btu
Abbreviation of British Thermal Unit.
Btu h-1
An abbreviation of British thermal units per hour, the unit of heat flow rate in the British system of units.
C
An abbreviation of coulomb, the quantity of charge which passes any section of a conductor in one second when a current of one ampere is flowing.
Cable Length
Originally the length of a ship′s anchor cable, 120 fathoms.
cal
An abbreviation of calorie, a unit of energy in the British system of units.
Calendar Year
1 calendar year = 31.536x106 seconds
Calorie
A unit of energy in the British system of units. Still used to define the amount of energy amount of energy contained in foods.
Calorie per Second
Unit of power.
Calorific Value
The ratio of energy to volume measured in joules per cubic metre.
Candela
The SI unit of luminous intensity.
Canonical Time Unit
For geocentric orbits, the time required by a hypothetical satellite to move one radian in a circular orbit of the earth's equatorial radius.
cc
Abbreviation of Cubic Centimetre.
CCF
An abbreviation for 100 cubic feet.
cd
An abbreviation of candela, the SI unit of luminous intensity.
Celsius Temperature Scale
The centigrade scale of temperature was defined as 0°C at the ice point of water and as 100°C at the boiling point of water (at 1 standard atmosphere).
Centigrade
The centigrade scale of temperature was defined as 0°C at the ice point of water and as 100°C at the boiling point of water (at 1 standard atmosphere).
Centigrade Heat Unit
The amount of heat necessary to raise one pound weight of water through 1° C.
centihg
1 centimetre of mercury.
Centimetre
The centimetre is a unit of length and is one hundredth of a metre by definition.
Centimetre Gramme Second
A system of units in which the fundamental units are centimetre, gramme and second.
Centimetre of Mercury
A traditional unit of pressure equal to 1.333 22 kilopascal.
Centimetre of Water
A unit of pressure equal to the pressure exerted at the Earth′s surface by a water column 1 centimetre high, approximately 98.067 pascals.
centipoise
One hundredth of a poise, the CGS derived unit of dynamic viscosity of a fluid.
CGS Units
Abbreviation for centimetre-gramme-second.
Chu
Abbreviation of centigrade heat unit.
Circular Mil Foot
A unit of volume of a conductor having a cross-sectional area of 1 circular mil and a length of 1 foot.
Civil Year
A year as measured by the conventional calendar, equal to 365 days in most years but 366 days in a leap year.
cm
The centimetre is a unit of length and is one hundredth of a metre by definition.
cmHg
Abbreviation of Centimetre of Mercury.
Collision Density
The rate at which collisions are occurring per unit volume per unit time.
Coulomb
Defined as the quantity of charge which passes any section of a conductor in one second when a current of one ampere is flowing.
cP
An abbreviation of centipoise, one hundredth of a poise. The CGS derived unit of dynamic viscosity of a fluid.
CPS
Abbreviation of cycles per second.
Crith
A unit of mass sometimes used in the physics and chemistry of gases. The crith is equal to the mass of a litre of hydrogen at standard temperature and pressure, this is about 89.885 milligrams.
Cross Sectional Area
The area of a slice of an object.
Cubic Centimetre
Abbreviated as cm3 or cc.
Cubic Foot
1 cubic foot = 0.0283168 m3
Cubic Foot per Minute
British imperial unit of flow rate.
Cubic Foot per Second
British imperial unit of flow rate.
Cubic Inch
The cubic inch has traditionally been used in American to define the swept volume of internal combustion engines.
Cubic Metre
SI unit of volume.
Cubic Yard
1 cubic yard = 0.764555 m3
Cubit
Unit of length equal to 457.2x10-3m.
cufm
Cubic foot per minute, a British imperial unit of flow rate.
cumec
A unit of flow rate and an abbreviation of cubic metres per second.
cusec
Abbreviation of cubic foot per second.
cwt
Abbreviation of hundredweight, this is an imperial unit of mass.
dalton
The atomic mass unit is sometimes called the dalton, after John Dalton.
dB FS
Abbreviation for decibels full scale, a unit of power as measured by a digital device.
dbar
Abbreviation of decibar.
dBrn
Symbol for decibels above reference noise, a unit measuring noise levels in telecommunications.
dBu
A logarithmic unit of power, similar to dB m but computed from voltage measurements.
dBZ
A unit of radar reflectivity used in meteorology. The unit measures the amount of energy returned to a weather radar site as a function of the amount transmitted.
Debye
Unit of dipole moment.
decametre
Abbreviated as dam, unit length equal to 10m.
decibar
A metric unit of pressure equal to 0.1 bar or 10 kilopascals.
Decibel
The human ear responds logarithmically and it is convenient to deal in logarithmic units in audio systems.
decigram
A metric unit of mass equal to 100 milligrams.
decilitre
Abbreviated as dl, unit volume equal to 10-1litre.
decimetre
Abbreviated as dm, unit length equal to 10-1m.
Denier
A unit used in measuring the thickness (fineness) of yarn. It is the mass in grams of 9000m of yarn.
dg
Abbreviation of decigram.
Didot Point
A unit of distance used in typography.
Dots Per Inch
A unit used to measure the resolution, or sharpness of an image.
dpa
Abbreviation of Displacements per Atom.
Drex
Used in the textile industry to measure the density of a single fiber of yarn.
Drum
Unit of volume sometimes used in the oil trade. The traditional standard drum of oil contains 55 U.S. gallons or about 208.198 litres.
dyad
A unit of quantity equal to 2, frequently used in cell biology and biotechnology.
Dyne
A force of 1 dyne acting on a mass of 1g imparts an acceleration of 1cms-2.
Earth Rate Unit
Unit of angular velocity equal to 15° per hour.
Electron Volt
Unit of energy of moving particles. Given by the kinetic energy acquired by an electron losing one volt of potential.
Eon
In astronomical terms, 1,000 million years.
Erg
Unit of energy equal to 100.0x10-9J.
ERU
Unit of angular velocity equal to 15° per hour.
F
An abbreviation of farad, the SI unit of capacitance.
Fahrenheit
On the Fahrenheit scale 0°C = 32°F and 100°C = 212°F
Farad
The SI unit of capacitance.
Faraday
Quantity of electrical charge associated with one mole of chemical charge equal to 96485.3C
Faraday Constant
F = 9.648456x104 Cmol-1
fc
Abbreviation of Foot Candle.
Feet
The plural of foot. One foot was defined as one third of the Imperial Standard yard. The abbreviation of foot is ft
Feet per Minute
Old imperial units of velocity, abbreviated as fpm or ft min-1.
Feet per Second Squared
Old imperial unit of acceleration.
Femtometre
Abbreviated as fm, unit of distance equal to 10-15m.
Fermi
A derived SI Unit of length equal to 10-15m
Fluid Ounce
20 fluid ounces = 1 pint
Foot
One foot was defined as one third of the Imperial Standard yard.
Foot Candle
A measure of light intensity on a surface being illuminated.
Foot Pound
Imperial unit of mechanical energy.
Foot Poundal
Unit of work, equal to the work done by a force of one poundal acting through a distance of one foot.
ft
One foot was defined as one third of the Imperial Standard yard. The abbreviation of foot is ft
ft lb
Abbreviation of foot pound, Imperial unit of mechanical energy.
ft min-1
Abbreviation of Feet per Minute.
ft2
Imperial unit of area.
ft3
Cubic foot.
ft3s-1
Cubic foot per second.
ft s-2
Abbreviation of Feet per Second Squared, an old imperial unit of acceleration.
Fujita-Pearson Scale
An empirical scale for estimating the wind speed of a tornado from the damage it causes.
Galactic Year
The unit of time in which the Solar System makes one revolution around the Milky Way galaxy.
galileo
The CGS unit of acceleration, one galileo is an acceleration of 1 centimetre per second per second.
Gallon
This unit of volume is defined in the British and American system of units. Note 1 UK gallon = 1.2 US gallons.
Gallons per Minute
Volume flow rate.
Geographical Mile
The length of 1 minute of arc of the equator.
GHz
Abbreviation of Gigahertz.
Giga electron Volt
One billion electron Volts.
Gigahertz
109 cycles per second.
GPM
Abbreviation of Gallons per Minute.
gram
The CGS unit of mass equal to 10-3kg.
gramme
Older spelling of gram, the CGS unit of mass equal to 10-3kg.
Hartley
A unit of information content equal to one of ten possible and equally likely values or states of anything used to store or convey information.
Hectare
An SI derived unit of area.
Inches
A secondary unit in the British system of units, now replaced by the SI system and the metre.
Joule
The SI unit of energy.
kBq
Abbreviation of kilobecquerel.
kilo calories
1000 calories.
kilo electron volts
Abbreviated as keV, one thousand electron volts.
kilo pounds per square inch
A unit of pressure used in the imperial system of units.
kilobase
A unit of genetic information equal to the information carried by 1000 pairs of the base units in the double-helix of DNA.
kilobecquerel
A unit of radioactivity equal to 1000 atomic disintegrations per second.
Kilogram
The SI unit of mass is the kilogram.
Kilogram Force
Equivalent to the force exerted by 1 kilogram due to the local acceleration due to gravity.
kilojoule
One thousand joules.
kilometre
A length equal to 1000 metres.
Kilometres Per Hour
Unit of velocity used by most land based vehicles.
kilorad
Common unit of radiation dose equal to 1000 rads.
kilowatt
One thousand watts.
kiloWatt hour
Unit of energy equal to 3.6x106J.
km
Abbreviation of kilometre.
krad
Abbreviation of kilorad.
kWh
Abbreviation of kiloWatt hour.
lbf ft
An abbreviation of pound-force foot, the unit of torque in the old British system of units.
Leap Year
Leap years are years with 366 days, instead of the usual 365.
Linear Foot
Term used loosely to describe a one-foot length of any long, narrow object. Primarily used to distinguish it from a square or cubic foot.
Litre
A derived SI unit of volume.
Litre Atmosphere
A unit of work or energy used in the study of confined gases.
lm h
Abbreviation of lumen hour.
Long Hundredweight
The British hundredweight, equal to 112 pounds.
Long Ton
The traditional British ton, equal to 2240 pounds.
lumen hour
A unit of quantity of light, equal to one lumen of light flux continued for one hour.
Lunar Day
Another name for the tidal day, a unit of time equal to 24 hours 50 minutes used in tidal predictions.
m2
SI unit of area.
mAh
Abbreviation of milliampere hour.
Megabarrel
One megabarrel equals 42 million U. S. gallons.
Megahertz
1000000Hz.
Megawatt
One million watts.
MegaWatt hours
A unit of energy equal to 1,000,000 watts for one hour.
Mercalli Scale
A measure of the intensity of an earthquake. This is a subjective value that varies depending on where the earthquake is observed.
Metre
The metre is the SI unit of length.
Metre Kilopond
Metric unit of torque equal to 9.806 65 newton metres (Nm) or 7.233 01 pound feet.
Metric Ounce
A unit of mass, equal to 25 grams. Also known as a mounce.
Metric Pound
An informal name for a mass of 500 grams.
Metric Second
Also known as a blink.
Metric System
The international decimal system of weights and measures based on the metre and the kilogram.
microampere
One millionth of an ampere.
microbar
A unit of pressure equal to one millionth of a bar.
Micrometre
One-millionth of a metre.
microvolt
One millionth of a volt.
milliampere hour
One thousandth of an Ampere-hour, Ah.
millibar
A unit of pressure equal to 1000 dynes per square centimeter, or 1/1000 of a bar.
milligal
A unit of acceleration equal to 1/1000 of a gal, or 1/1000 centimeter per second per second.
millimetre
milli is the prefix representing a multiplication of 10-3 and metre is the SI unit of length.
Million Cubic Feet Equivalent
A unit used in the natural gas industry for one million cubic feet of gas equivalent (cfe).
milliosmole
One thousandth of an Osmole.
Milliradian
This is one thousandth of a radian.
millitorr
Unit of pressure equal to 10-3 torr.
millivolt
A unit of electrical potential equal to one thousandth of a volt.
milliwatt
Unit of power equal to 0.001 watt.
mkp
Abbreviation of Metre Kilopond.
MKS System
A system of units based on the meter, the kilogram, and the second.
MKSA System
A system of units based on the meter, kilogram, second, and ampere.
MMCF
Symbol for one million cubic feet.
MMcfe
Abbreviation of Million Cubic Feet Equivalent.
Molar Flow Rate
The number of moles per unit time moving through a process.
mOsm
Abbreviation of milliosmole.
mounce
A unit of mass, equal to 25 grams.
mtu
Abbreviation of Metric Ton Unit.
mW
Abbreviation of milliWatt.
MWh
Abbreviation for MegaWatt hours.
Myrialitre
A unit of volume of ten thousand litres.
Myriametre
Ten-thousand metres.
nanoampere
One billionth of an ampere.
Nanometre
Abbreviated as nm, unit of length equal to 10-9 metres, and equal to 10 Å (Angstroms).
Nanosecond
One billionth of a second, 10-9 s.
nanovolt
One billionth of a volt.
Nautical Year
Also known as a Tropical Year.
Ncm
Abbreviation of Newton Centimetre.
Newton
The SI unit of force.
Newton Centimetre
Metric unit of torque equal to 0.01 newton metre.
Newton Metre
The SI unit of Torque.
nit
Unit of luminance, equal to one candela per square meter, or 10-4 stilb.
nm
Abbreviation of nanometer as nm, unit of length equal to 10-9 metres, and equal to 10 Å (Angstroms).
Nm
Abbreviation of newton metre, the SI unit of Torque.
Normal Litre
A unit of mass for gases equal to the mass of 1 litre at a pressure of 1 atmosphere and at a standard temperature, often 0°C or 20°C
ns
Abbreviation of nanosecond, 10-9 s.
Number of Gram Equivalent Weights
The number calculated by dividing the mass of a substance (in grams) by the equivalent weight of the substance.
okta
Unit of proportion equal to 1/8, used in meteorology to record the fraction of the sky covered by clouds.
Order of Magnitude
A logarithmic unit used to compare the sizes of quantities.
Osmole
The osmotic pressure of a one molar solution of a substance that does not dissociate, such as sugar in water.
Ounce Force
A derived unit of force in the British system of units.
Ounce per Gallon
A traditional unit of mass concentration.
Ounces
A secondary unit in the British system of units. 1 ounce (oz) = 28.34952 g
owu
Abbreviation of Open Window Unit which is the original name given to the unit Sabin.
ozf
Abbreviated of Ounce of Force.
Pa
The SI derived unit of pressure is the pascal.
Pace
The distance between two successive falls of the same foot.
Page
Unit of information in computer science, usually equal to 256 bytes.
Parts per Billion
A unit of proportion equal to 10-9. Abbreviated as ppb.
Parts per Quadrillion
A unit of proportion equal to 10-15.
Parts per Thousand
A unit of proportion equal to 0.001 abbreviated ppth and also called per mill.
pcf
Abbreviation of Pound per Cubic Foot.
Peck
An old unit of volume.
per annum
A traditional unit of frequency equal to once a year.
per Foot Run
A unit of measure in woodworking where the only dimension of concern is the length. The width and thickness are not included in the calculation.
per Foot Super
A square foot of wood of any thickness.
per mill
Parts per Thousand
PetaFlops
One quadrillion (1015) floating-point operations per second.
Pflops
One quadrillion (1015) floating-point operations per second.
Phot
Photometric unit of illuminance or illumination equal to 1 lumen per square centimetre.
picogram
A mass equal to 10-12g.
picolitre
A volume equal to 10-12l.
picometre
A distance equal to 10-12 metres.
Poise
Named after the physicist Poiseuille this is the CGS derived unit of dynamic viscosity.
Pound Force Foot
The unit of torque in the old British system of units, abbreviated lbf ft.
Pound per Cubic Foot
Traditional unit of density.
Pound per Cubic Inch
Traditional unit of density.
Pounds per Square Inch
A British imperial unit of pressure. 1.0 psi = 6894.757 Pa
ppb
Abbreviation of Parts per Billion.
ppth
Abbreviation of Parts per Thousand.
Pyron
A unit of radiant intensity of electromagnetic radiation equal to 1 calorie per square centimeter per minute.
Q unit
A unit of heat energy equal to one quintillion (1018) Btu.
Radian per Second
A common unit of angular velocity.
Rebar Size
Numerical size designations for steel reinforcing bars used to strengthen concrete.
Reciprocal Megakelvin
A unit used in colorimetry and photography to measure the wavelength of light, especially for selecting filters to adjust the colour temperature.
Revolutions per Kilometre
A unit for the number of times a tyre rotates in one kilometre of travel.
Richter Scale
A measure of the magnitude of an earthquake at its epicentre. Each point increase on the Richter scale is a 30 times increase in the magnitude.
Rise Run
For smaller angles, the ratio obtained when the change in offset between two centre lines is divided by the distance along either centerline.
RPK
Abbreviation of Revolutions per Kilometre.
RSI
A symbol for the R-value of insulation when stated in SI units.
Saltspoon
A unit of volume formerly used in U.S. food recipes and equal to 1/4 teaspoon.
Shore Hardness
A hardness measure determined by a Shore durometer.
Short Ton
A common name for the U.S. ton equal to 2000 pounds.
Sidereal Year
1 sidereal year = 31.55815x106 seconds
Siegbahn Unit
A unit of distance used for describing the wavelength of x-rays.
Slinch
Equal to 12 slugs, an old unit of mass.
Specific Volume
The volume of a unit mass of substance, the reciprocal of density.
Square Feet
Imperial unit of area.
Square Metre
The derived SI unit of area.
Statampere
The unit ofcurrent in the obsolete electrostatic system of units.
Statcoulomb
The unit of charge in the obsolete electrostatic system of units.
Statfarad
The unit of capacitance in the obsolete electrostatic system of units.
Statvolt
The unit of electromotive force in the obsolete electrostatic system of units.
Statwatt
The unit of power in the obsolete electrostatic system of units.
tce
Abbreviation of Tonne of Coal Equivalent.
Tera Electron Volt
One trillion electron Volts.
Terahertz
One trillion cycles per second, 1012 Hz.
Thousandths of an Inch
Often abbreviated as thou. A unit of length used by engineers.
Threads per Inch
The number of threads in a linear inch along the length of a threaded component.
THz
Abbreviation of terahertz, 1012 Hz.
Tonne of Coal Equivalent
A unit of energy equivalent to 29.308 gigajoules.
Tons per Square Inch
Old imperial unit of pressure, abbreviated as Tsi or tonf in-2.
Torino Number
An arbitrary scale to express the likelihood that an asteroid or comet might collide with the Earth causing damage.
tpi
Abbreviation of Threads per Inch.
Tropical Year
1 tropical year = 31.55693x106 seconds
Troy Ounce
An old British unit of mass mainly used for measuring prescious metals. 1 troy ounce = 31.1035 g
Unit of Blood
Unit of volume for human blood and its components.
Units Books
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Units Calculations
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Units Conversions
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Units Weblinks
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UT
Abbreviation of Universal Time.
Viscous Force
The force per unit volume or per unit mass arising from the action of tangential stresses in a moving viscous fluid.
Volt
The volt is the SI unit of electromotive force.
Volt Amperes Reactive
Unit used to measure reactive power in an AC electric power system.
Volt-Ampere
The amount of apparent power in an electrical circuit, equal to the product of voltage and current.
Voltampere (VA)
The product of rms voltage and rms current in an electronic circuit. It is the unit of apparent power in the International System of Units (SI).
Volume
There are a number of derived units of volume in the British system of units and the SI system of units.
Watt
The watt is the SI unit of power and is equal to 1 joule per second.
Watt Hour
A unit of energy equivalent to one watt of power expended for one hour of time.
Watt Hour Meter
A meter used to measure electrical energy.
Watt Hours per Kilogram
Unit of energy density.
Weber
The weber is the SI unit of magnetic flux.
Winchester Gallon
The US gallon, equivalent to 3.785411784 litres.
Yard
The yard was a unit of length of the British system of units.
Yard of Ale
A traditional Scottish measure of volume that is roughly 2.5 pints and served in a slender, yard-tall glass.
yd
An abbreviation of yard, a standard unit of length of the British system of units.
Year
1 calendar year = 31.536x106 seconds
Yottametre
A metric unit of distance equal to 1024 metres.
Zettametre
A metric unit of distance equal to 1021 metres.
Zhubov Scale
A scale for reporting ice coverage of polar seas.

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