FACTOID # 120: 61.5% of Swedes work more than 40 hours per week, but just across the border in Norway only 15.8% of people work this long.
 
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Encyclopedia > Orders of magnitude (density)
Orders of magnitude
area
angular velocity
currency
data
density
energy
frequency
length
mass
numbers
power
pressure
specific heat capacity
speed
temperature
time
torque
volume
Conversion of units
physical unit
SI
SI base unit
SI derived unit
SI prefix
Planck units
List of orders of magnitude for density
Factor Multiple Value Item
10-27 1 yoctogram (yg)/m3 1 × 10-27 kg/m3 very approximate density of the universe
10-24 1 zeptogram (zg)/m3
10-22 100 zg/m3 1 × 10-22 kg/m3 probable lowest observed density of space in galactic spiral arm (1 hydrogen atom every 16 cubic centimetres)
10-21 1 attogram (ag)/m3
10-20
10-19
10-18 1 femtogram (fg)/m3 1 × 10-18 kg/m3 observed density of space in core of galaxy (600 hydrogen atoms in every cubic centimetre)
10-17 10 fg/m3 1 × 10-17 kg/m3 best vacuum from a laboratory (1.3 nPa)
10-16
10-15 1 picogram (pg)/m3
10-14
10-13
10-12 1 nanogram (ng)/m3
10-11
10-10
10-9 1 microgram (μg)/m3
10-8
10-7
10-6 1 milligram (mg)/m3
10-5 1.34 × 10-5 kg/m3 Earth atmosphere at 82 kilometre altitude
10-4 1.09 × 10-4 kg/m3 Earth atmosphere at 68 kilometre altitude
10-3 1 gram (g)/m3 1 gram (g)/m3 vacuum from a mechanical vacuum pump
10-2 10 gram (g)/m3 1.35 × 10-2 kg/m3 Earth atmosphere at 32 kilometre altitude
90 g/m3 hydrogen gas, the least dense substance at STP
10-1 1.66 × 10-2 Earth atmosphere at 16 kilometre altitude
100 1 kilogram (kg)/m3 1.48 kg/m3 Earth atmosphere at sea level
3 kg/m3 typical density of aerogel
101
102 945 kg/m3 average human body after inhalation
985 kg/m3 average human body
103 1 megagram (Mg)/m3
1 tonne (t)/m3		 1000 kg/m3 liquid water at 4°C
1025 kg/m3 average human body after exhalation
104 10000 kg/m3 10490 kg/m3 silver
11340 kg/m3 lead
22650 kg/m3 iridium, the densest known substance at STP
105 150,000 kg/m3 core of the Sun
106 1 gigagram (Gg)/m3
107
108
109 1 teragram (Tg)/m3 white dwarf
1010
1011
1012 1 petagram (Pg)/m3
1013 1 × 1013 kg/m3 2 × 1013 kg/m3 Universe at end of electroweak epoch (approximately)
1014
1015 1 exagram (Eg)/m3
1016
1017 2 × 1017 kg/m3 atomic nuclei and neutron stars
1018 1 zettagram (Zm)/m3
1019
1020
1021 1 yottagram (Yg)/m3
…
1096 5.1 × 1096 kg/m3 Planck density

An order of magnitude is the class of scale or magnitude of any amount, where each class contains values of a fixed ratio to the class preceding it. ... Categories: Orders of magnitude (area) ... To help compare different orders of magnitude, the following list describes various angular velocity levels between 1×10−7 rad·s−1 and 1×107 rad·s−1. ... This is a list of orders of magnitude for data (or information), measured in bits. ... To help compare different orders of magnitude, the following list describes various frequencies. ... Categories: | ... To help compare different orders of magnitude, the following list describes various mass levels between 10−36 kg and 1053 kg. ... This list compares various sizes of positive numbers, including counts of things, dimensionless numbers and probabilities. ... This page lists examples of the power in watts produced by various different sources of energy. ... 1 At earth mean sea level. ... This is a table of specific heat capacities by magnitude. ... To help compare different orders of magnitude, the following list describes various speed levels between 1. ... Circumstances where water naturally occurs in liquid form are shown in light grey. ... The pages linked in the right-hand column contain lists of times that are of the same order of magnitude (power of ten). ... The pages linked in the right-hand column contain lists of volumes that are of the same order of magnitude (power of ten). ... Conversion of units refers to conversion factors between different units of measurement for the same quantity. ... The definition, agreement and practical use of units of measurement have played a crucial role in human endeavour from early ages up to this day. ... Look up si, Si, SI in Wiktionary, the free dictionary. ... The SI system of units defines seven SI base units: physical units defined by an operational definition. ... SI derived units are part of the SI system of measurement units and are derived from the seven SI base units. ... An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple. ... In physics, Planck units are physical units of measurement defined exclusively in terms of the five universal physical constants shown in the table below in such a manner that all of these physical constants take on the numerical value of one when expressed in terms of these units. ... In physics, density is mass m per unit volume V. For the common case of a homogeneous substance, it is expressed as: where, in SI units: ρ (rho) is the density of the substance, measured in kg·m-3 m is the mass of the substance, measured in kg V is... The prefix yocto- is used to multiply the coefficient 10^-24 to the value of a physical quantity, so 1 yoctogram equals 1 * 10^-24 grams. ... For other uses, see Universe (disambiguation). ... A zeptogram (symbol: Zg) is an SI unit of mass. ... An attogram is a SI unit of mass. ... The femtogram is an SI unit of mass (symbol fg) defined as: 1 fg = 1 × 10-18 kilogram ( = 1 × 10-15 gram) A femtogram is one quadrillionth (1/1000000000000000) of a gram. ... The picogram is an SI unit of mass (symbol pg) defined as: 1 pg = 1 × 10-15 kilogram (1 × 10-12 gram) A picogram is one trillionth (1/1000000000000) of a gram. ... The nanogram is an SI unit of mass (symbol ng) defined as: 1 ng = 1 × 10-12 kilogram (1 × 10-9 gram) A nanogram is one billionth (1/1,000,000,000) of a gram. ... In the metric system, a microgram is 1/1,000,000 of a gram, or 1/1000 of a milligram, is one of the smallest units of weight/mass commonly used. ... The milligram (symbol mg) is an SI unit of mass. ... BIC pen cap, about 1 gram. ... BIC pen cap, about 1 gram. ... The Roots blower is one example of a vacuum pump A vacuum pump is a pump that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. ... BIC pen cap, about 1 gram. ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... In chemistry and other sciences, STP or standard temperature and pressure is a standard set of conditions for experimental measurements, to enable comparisons to be made between sets of data. ... The kilogram or kilogramme (symbol: kg) is the SI base unit of mass. ... This article or section is in need of attention from an expert on the subject. ... Physical Features of the Human Body The human body is the entire physical structure of a human organism. ... A tonne (also called metric ton) is a non-SI unit of mass, accepted for use with SI, defined as: 1 tonne = 103 kg (= 106 g). ... A tonne or metric ton (symbol t), sometimes referred to as a metric tonne, is a measurement of mass equal to 1,000 kilograms. ... Impact from a water drop causes an upward rebound jet surrounded by circular capillary waves. ... Celsius is, or relates to, the Celsius temperature scale (previously known as the centigrade scale). ... General Name, Symbol, Number silver, Ag, 47 Chemical series transition metals Group, Period, Block 11, 5, d Appearance lustrous white metal Standard atomic weight 107. ... For Pb as an abbreviation, see PB. General Name, Symbol, Number lead, Pb, 82 Chemical series Post-transition metals or poor metals Group, Period, Block 14, 6, p Appearance bluish gray Standard atomic weight 207. ... This article is about the chemical element. ... In chemistry and other sciences, STP or standard temperature and pressure is a standard set of conditions for experimental measurements, to enable comparisons to be made between sets of data. ... Sol redirects here. ... The gigagram is an SI unit of mass, with symbol Gg. ... A teragram (symbol: Tg) is an SI unit of mass. ... This article or section does not adequately cite its references or sources. ... A petagram (symbol: Pg) is an SI unit of mass. ... This article does not cite any references or sources. ... An exagram (symbol: Eg) is an SI unit of mass. ... The nucleus of an atom is the very small dense region, of positive charge, in its centre consisting of nucleons (protons and neutrons). ... For the Hugo Award-winning story by Larry Niven, see Neutron Star (story). ... A zettagram (symbol: Zg) is an SI unit of mass. ... A yottagram (symbol: Yg) is an SI unit of mass. ... The Planck density is the natural unit of density, denoted by ρP. ρP = Planck mass / (Planck length)3 = ≈ 5. ...

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Computer storage density (541 words)
Also, storage densities computed for comparison of technologies usually ignore physical containment; that is, memory density is computed based upon the number of bits relative to the surface of the integrated circuit, rather than the surface of the encasement.
Computer storage density is a measure of the quantity of information bits that can be stored on a given length of track, area of surface, or in a given volume; of a computer storage medium.
Computer storage density is compared by density in order to measure the efficiency of the storage.
Is the cosmological constant nonzero? (1477 words)
This term acts like a vacuum energy density, an idea which has become quite fashionable in high energy particle physics models since a vacuum energy density of a specific kind is used in the Higgs mechanism for spontaneous symmetry breaking.
We don't know what this mechanism is, but it seems reasonable that suppression by 122 orders of magnitude, which would make the effect of the vacuum energy density on the Universe negligible, is just as probable as suppression by 120 orders of magnitude.
And 124, 126, 128 etc. orders of magnitude should all be just as probable as well, and all give a negligible effect on the Universe.
  More results at FactBites »

 

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