Since 1983, defined as length of the path travelled by light in vacuumĭuring a time interval of 1/299,792,458 of a second. Length of the longest pine cones, produced by the sugar pine Īverage length of a rapier, a fencing sword One-tenth inch distance between pins in DIP (dual-inline-package) electronic componentsĭiameter of the projectile in 5.56×45mm NATO ammunitionĪpproximate width of an adult human fingerĭimensions of a credit card, according to the ISO/IEC 7810 ID-1 standardĭiameter of a baseball, according to Major League Baseball guidelines Length of an average flea is 1–10 mm (usually <5 mm) Maximum diameter of Thiomargarita namibiensis, the largest bacterium ever discovered (as of 2010 ) Thickness of the central area of a human cornea Size of a pixel on a 17-inch monitor with a resolution of 1024×768 Width of transistors in the Intel 4004, the world's first commercial microprocessor Typical size of a fog, mist, or cloud water droplet Typical diameter of the human immunodeficiency virus (HIV) Īpproximate wavelength range of visible light Ĭellular to human scale Factor ( m) Thickness of cell wall in Gram-negative bacteria Īs of 2016, the 10 nanometre was the smallest semiconductor device fabrication node įlying height of the head of a hard disk Smallest microprocessor transistor gate oxide thickness (as of January 2007 ) Upper bound of the typical size range for "fundamental strings" Ītomic to cellular scale Factor ( m)Īpproximate limit of the gluon-mediated color force between quarks Įffective cross section radius of an 11 MeV proton Īpproximate limit of the meson-mediated nuclear binding force ĭiameter range of the atomic nucleus ĭistance between atomic nuclei in a white dwarfġ ångström (also covalent radius of sulfur atom )Īverage size of the water molecule (actual lengths may vary)ĭiameter of a carbon nanotube Diameter of smallest transistor gate (as of 2016) Sensitivity of the LIGO detector for gravitational waves Upper limit for the size of quarks and electrons Preons, hypothetical particles proposed as subcomponents of quarks and leptons the upper bound for the width of a cosmic string in string theoryĮffective cross section radius of high-energy neutrinos ĭe Broglie wavelength of protons at the Large Hadron Collider (4 TeV as of 2012 ) Quantum foam is thought to exist at this scale.Įffective cross section radius of 1 MeV neutrinos Planck length typical scale of hypothetical loop quantum gravity or size of a hypothetical string and of branes according to string theory, lengths smaller than this do not make any physical sense. To help compare different orders of magnitude, the following list describes various lengths between 1.6 × 10 − 35 metres. Huge-LQG, Hercules–Corona Borealis Great Wall, Observable universe Mount Everest, length of Panama Canal and Trans-Siberian Railway, larger asteroidĪ light-year, the distance to Proxima Centauri Piano, human, automobile, sperm whale, football field, Eiffel Tower Mosquito, golf ball, domestic cat, violin, football ![]() Wavelength of gamma rays and X-rays, hydrogen atomĭNA helix, virus, wavelength of optical spectrum, transistors used in CPUsīacterium, fog water droplet, human hair's diameter The following are examples of orders of magnitude for different lengths.įixed value (not a range). ![]() JSTOR ( January 2020) ( template removal help).Unsourced material may be challenged and removed.įind sources: "Orders of magnitude" length – news Please help improve this article by adding citations to reliable sources. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types.This article needs additional citations for verification. You can find metric conversion tables for SI units, as well as English units, currency, and other data. It stands for "parallax of one arc second", and is approximately 19,131,554,073,600 (19 trillion) miles.Ĭ provides an online conversion calculator for all types of measurement units. The parsec (symbol pc) is a unit of length used in astronomy. The definition of a parsec is as follows: The SI prefix "kilo" represents a factor of More specifically, a light year is defined as the distance that a photon would travel, in free space and infinitely far away from any gravitational or magnetic fields, in one Julian year (365.25 days of 86400 seconds each). Kiloparsec to light year, or enter any two units below: Enter two units to convert From:Ī light year, abbreviated ly, is the distance light travels in one year: roughly 9.46 × 1012 kilometres (9.46 petametres, or about 5.88 × 1012 (nearly six trillion) miles). You can do the reverse unit conversion from
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