That's Small !

Click here for laughs ( the Cigar Guy)

Human Hair (18 to 180 µm)

• 1.6 × 10⁻³⁵ metres = the Planck length (lengths smaller than this do not make any physical sense, according to current theories of physics)
• ...........11 orders of magnitude larger

• 1 × 10⁻²⁴ metres = 1 ym (yoctometre), the smallest named subdivision of the metre in the SI base unit of length.
• One septillionth of a meter.
• 1 × 10⁻²³ metres = 10 ym (yoctometres)
• 2 × 10⁻²³ metres = 20 ym, the effective cross-section radius of 1 MeV neutrinos as measured by Clyde Cowan and Frederick Reines[1]
• 100 yoctometres till 1 zeptometre range
• 1 × 10⁻²¹ metres = 1 zeptometre (zm) = 1,000 yoctometres
• 2 × 10⁻²¹ metres = radius of effective cross section for a 20 GeV neutrino scattering off a nucleon^[1]
• 7 × 10⁻²¹ metres = radius of effective cross section for a 250 GeV neutrino scattering off a nucleon^[1] 
• 10 zm till 100 zeptometres range
• 177 zm — de Broglie wavelength of protons at the Large Hadron Collider (7 TeV as of 2010)
• 1 am = 1 attometre = 1,000 zeptometres
• 1 am — sensitivity of the LIGO detector for gravitational waves 
• 10 am till 100 attometres range
• 100 attometres till 1 femtometre range
• 0.85 fm — approximate proton radius^[1]
• 1 fm = 1 femtometre = 1,000 attometres
• 1.5 fm — diameter of the Scattering Cross Section of an 11 MeV proton with a target proton^[1]
• 2.81794 fm — classical electron radius^[2]
• 7 fm — the radius of the effective scattering cross section for a gold nucleus scattering a 6 MeV alpha particle over 140 degrees^[1]
• 1 pm = 1 picometre = 1,000 femtometres
• 1 pm = distance between atomic nuclei in a white dwarf^{[clarification needed]}
• 2.4 pm — The Compton wavelength of the electron.
• 5 pm — shorter X-ray wavelengths (approx.)
• 25 pm — empirical radius of hydrogen atom^[1]
• 28 pm — covalent radius of helium atom^[2]
• 31 pm — covalent radius of hydrogen atom^[1]
• 31 pm — calculated radius of helium atom^[2]
• ~50 pm — best resolution of a high-resolution transmission electron microscope^[3]
• 53 pm — calculated radius of hydrogen atom^[1]
• 100 pm — 1 ångström
• 100 pm — covalent radius of sulfur atom^[1]
• 120 pm — van der Waals radius of a neutral hydrogen atom^[2]
• 126 pm — covalent radius of ruthenium atom
• 135 pm — covalent radius of technetium atom
• 153 pm — covalent radius of silver atom
• 154 pm — mode length of (C-C) covalent bond
• 155 pm — covalent radius of zirconium atom
• 175 pm — covalent radius of thulium atom
• 200 pm — highest resolution of a typical electron microscope^[3]
• 225 pm — covalent radius of caesium atom
• 340 pm — thickness of single layer graphene
• 356.68 pm — width of diamond cell (unit cell)
• 403 pm — width of lithium fluoride cell
• 500 pm — width of α helix protein
• 560 pm — width of sodium chloride cell
• 700 pm — width of glucose molecule
• 780 pm — mean width of quartz cell
• 820 pm — mean width of ice cell
• 900 pm — mean width of coesite cell
• 900 pm — width of sucrose molecule
• 1 nm = 1 nanometre = 1000 picometres = 10 ångströms
• 1 nm — rough length of a sucrose molecule, as calculated by Albert Einstein^{[citation needed]}
• 1.1 nm — diameter of a single-walled carbon nanotube^{[citation needed]}
• 2 nm — diameter of DNA helix^{[citation needed]}
• 3 nm — flying height of the head of a hard disk^{[citation needed]}
• 3.4 nm — length of a DNA turn (10 bp)^{[citation needed]}
• 3 × 8 nm — size of an albumin protein molecule^{[citation needed]}
• 6.8 nm — width of a haemoglobin molecule^{[citation needed]}
• 10 nm = 10 nanometres = 10⁻⁸ metres
• 10 nm — lower size of tobacco smoke^[1]
• 10 nm — typical diameter of nanowire^{[citation needed]}
• 11 nm — the average half-pitch of a memory cell speculated to be manufactured in 2015.
• 16 nm — technology is projected to be reached by semiconductor companies in the 2013 timeframe
• 20 nm — width of bacterial flagellum^{[citation needed]}
• 20 nm to 80 nm — thickness of cell wall in gram-positive bacteria^{[citation needed]}
• 22 nm — Smallest feature size of production microprocessors in September 2009^[2]
• 22 nm — the average half-pitch of a memory cell expected to be manufactured at around the 2011–2011 time frame.
• 30 nm — lower size of cooking oil smoke^[1]
• 32 nm — the average half-pitch of a memory cell manufactured at around the 2009–2010 time frame.
• 40 nm — width of tobacco mosaic virus^{[citation needed]}
• 40 nm — extreme ultraviolet wavelength^{[citation needed]}
• 45 nm — the average half-pitch of a memory cell manufactured at around the 2007–2008 time frame.
• 50 nm — upper size for airborne virus particles^[1]
• 65 nm — the average half-pitch of a memory cell manufactured at around the 2005–2006 time frame.
• 90 nm — the average half-pitch of a memory cell manufactured at around the 2002–2003 time frame.
• 90 nm — Human immunodeficiency virus (HIV) (Generally, viruses range in size from 20 nm to 450 nm.)^{[citation needed]}
• 100 nm — larger than 90% of the particles of wood smoke^{[citation needed]} (ranges from 7 to 3000 nanometres)^[1]
• 100 nm — greatest particle size that can fit through a surgical mask^[1]

• 100 nm — 90% of particles in wood smoke are smaller than this.^{[citation needed]}
• 120 nm — greatest particle size that can fit through a ULPA filter^{[citation needed]}
• 125 nm — standard depth of pits on compact discs (width: 500 nm, length: 850 nm to 3.5 µm)
• 180 nm — typical length of the rabies virus
• 200 nm — typical size of a Mycoplasma bacterium, among the smallest bacteria
• 280 nm — near ultraviolet wavelength
• 300 nm — greatest particle size that can fit through a HEPA (High Efficiency Particulate Air) filter (N100 removes up to 99.97% at 0.3 micrometres, N95 removes up to 95% at 0.3 micrometres)^{[citation needed]}
• 380–420 nm — wavelength of violet light (see color and optical spectrum)
• 420–440 nm — wavelength of indigo light
• 440–500 nm — wavelength of blue light
• 500–520 nm — wavelength of cyan light
• 520–565 nm — wavelength of green light
• 565–590 nm — wavelength of yellow light
• 590–625 nm — wavelength of orange light
• 625–740 nm — wavelength of red light
• 700–1400 nm — Wavelength of near-infrared radiation
• ~0.7–300 µm — Wavelength of infrared radiation
• 1 µm — the side of square of area 10⁻¹² m²
• 1 µm — edge of cube of volume 1 fL
• 1–10 µm — diameter of typical bacterium
• 1.55 µm — wavelength of light used in optical fibre
• 3–4 µm — size of a typical yeast cell
• 3–5 µm — size of a human spermatozoon's head (radius by length)^{[citation needed]}
• 6 µm — anthrax spore
• 6–8 µm — diameter of a human red blood cell
• 7 µm — diameter of the nucleus of typical eukaryotic cell
• 3–8 µm — width of strand of Spider web silk^[1]
• 8 µm — width of a chloroplast
• 9 µm — thickness of the tape in a 120-minute compact cassette.
• about 10 µm — size of a fog, mist or cloud water droplet
• 10 µm — width of cotton fibre^[1]
• 10 µm — transistor width of the Intel 4004, the world's first commercial microprocessor
• 10 µm — mean longest dimension of a human red blood cell
• 5–20 µm — dust mite excreta^[2]
• 10.6 µm — wavelength of light emitted by a carbon dioxide laser
• 13 µm - width of nylon fibre^{[citation needed]}
• 14 µm - width of polyester fibre^{[citation needed]}
• 15 µm — width of silk fibre
• 16 µm — diameter of a micromirror in a typical Digital micromirror device
• 17 µm — length of a tobacco mosaic virus
• 17.6 µm — one twip, a unit of length in typography
• 10 to 55 µm — width of wool fibre^[1]
• 25.4 µm — 1/1000 inch, commonly referred to as 1 mil in the U.S. and 1 thou in the UK
• 30–50 µm — diameter of a minicolumn in the human cortex^{[citation needed]}
• 41 µm — In male humans, spermatozoon cells have a tail 41 µm long^{[citation needed]}
• 50 µm — typical length of Euglena gracilis, a flagellate protist
• 50 µm — typical length of a human liver cell, an average-sized body cell
• 80 µm — average width of human hair (ranges from 18 to 180 µm) - see photograph above
• 90 µm — paper thickness in average
• 760 µm – thickness of a credit card <== My wife's weapon of choice. I'm thinking how many hours do we have to work into a week to pay it off? I'm thinking ... sometime on Thursday

Click here for an orders of ten magnitude interactive visualization from the galactic to the quark.

In words (long scale)	In words (short scale)	Prefix	Symbol	Decimal	Power of ten	Order of magnitude
quadrillionth	septillionth	yocto-	y	0.000000000000000000000001	10−24	−24
trilliardth	sextillionth	zepto-	z	0.000000000000000000001	10−21	−21
trillionth	quintillionth	atto-	a	0.000000000000000001	10−18	−18
billiardth	quadrillionth	femto-	f	0.000000000000001	10−15	−15
billionth	trillionth	pico-	p	0.000000000001	10−12	−12
milliardth	billionth	nano-	n	0.000000001	10−9	−9
millionth	millionth	micro-	µ	0.000001	10−6	−6
thousandth	thousandth	milli-	m	0.001	10−3	−3
hundredth	hundredth	centi-	c	0.01	10−2	−2
tenth	tenth	deci-	d	0.1	10−1	−1
one	one	-	-	1	100	0
ten	ten	deca-	da	10	101	1
hundred	hundred	hecto-	h	100	102	2
thousand	thousand	kilo-	k	1,000	103	3
million	million	mega-	M	1,000,000	106	6
milliard	billion	giga-	G	1,000,000,000	109	9
billion	trillion	tera-	T	1,000,000,000,000	1012	12
billiard	quadrillion	peta-	P	1,000,000,000,000,000	1015	15
trillion	quintillion	exa-	E	1,000,000,000,000,000,000	1018	18
trilliard	sextillion	zetta-	Z	1,000,000,000,000,000,000,000	1021	21
quadrillion	septillion	yotta-	Y	1,000,000,000,000,000,000,000,000	1024	24

King Tut's death mask is safe and sound. Looks good, too.