This page lists examples of the orders of magnitude of molar concentration. Source values are parenthesized where unit conversions were performed.
M denotes the non-SI unit molar:
Factor (Molarity) | SI prefix | Value | Item |
---|---|---|---|
10−24 | yM | 1.66 yM | 1 elementary entity per litre [1] |
8.5 yM | airborne bacteria in the upper troposphere (5100/m3) [2] | ||
10−23 | |||
10−22 | |||
10−21 | zM | 3.6 zM | solar neutrinos on Earth (6.5×1010 /cm2⋅s) [3] |
10−20 | 12 zM | radon in ambient, outdoor air in the United States (0.4 pCi/L ≈ 7000/L) [4] | |
10−19 | 120 zM | indoor radon at the EPA's "action level" (4 pCi/L ≈ 70000/L) [5] | |
686 zM | cosmic microwave background photons in outer space (413/cm3) [6] | ||
10−18 | aM | ||
10−17 | |||
10−16 | |||
10−15 | fM | 2 fM | bacteria in surface seawater (1×109/L) [7] |
10−14 | 20 fM | virions in surface layer North Atlantic seawater (10×109/L) [8] | |
50–100 fM | gold in seawater [9] | ||
10−13 | |||
10−12 | pM | 7.51–9.80 pM | normal range for erythrocytes in blood in an adult male ((4.52–5.90)×1012/L) [10] [11] |
10−11 | 10–100 pM | gold in undersea hydrothermal fluids [9] | |
10−10 | 170 pM | upper bound for healthy insulin when fasting [12] | |
10−9 | nM | 5 nM | inhaled osmium tetroxide is immediately dangerous to life or health (1 mg Os/m3) [13] |
10−8 | |||
10−7 | 101 nM | hydronium and hydroxide ions in pure water at 25 °C (pKW = 13.99) [14] | |
10−6 | μM | ||
10−5 | |||
10−4 | 180–480 μM | normal range for uric acid in blood [10] | |
570 μM | inhaled carbon monoxide induces unconsciousness in 2–3 breaths and death in < 3 min (12800 ppm) [15] | ||
10−3 | mM | 0.32–32 mM | normal range of hydronium ions in stomach acid (pH 1.5–3.5) [16] |
5.5 mM | upper bound for healthy blood glucose when fasting [17] | ||
7.8 mM | upper bound for healthy blood glucose 2 hours after eating [17] | ||
10−2 | cM | 20 mM | neutrinos during a supernova, 1 AU from the core (1058 over 10 s) [18] |
44.6 mM | pure ideal gas at 0 °C and 101.325 kPa [19] | ||
10−1 | dM | 140 mM | sodium ions in blood plasma [10] |
480 mM | sodium ions in seawater [20] | ||
100 | M | 1 M | standard state concentration for defining thermodynamic activity [21] |
101 | daM | 17.5 M | pure (glacial) acetic acid (1.05 g/cm3) [22] |
40 M | pure solid hydrogen (86 g/L ) [23] | ||
55.5 M | pure water at 3.984 °C, temperature of its maximum density (1.0000 g/cm3) [24] | ||
102 | hM | 118.8 M | pure osmium at 20 °C (22.587 g/cm3) [25] |
140.5 M | pure copper at 25 °C (8.93 g/cm3) | ||
103 | kM | ||
104 | 24 kM | helium in the solar core (150 g/cm3 ⋅ 65%) [26] | |
105 | |||
106 | MM | ||
107 | |||
108 | 122.2 MM | nuclei in a white dwarf from a 3 M☉ progenitor star (106.349 g/cm3) [27] | |
109 | GM | ||
1010 | |||
1011 | |||
1012 | TM | ||
1013 | |||
1014 | |||
1015 | PM | ||
1016 | |||
1017 | 228 PM | nucleons in atomic nuclei (2.3×1017 kg/m3 = 1.37×1044/m3) [28] | |
1018 | EM | ||
... | |||
1077 | 3.9×1077 M | the Planck concentration (2.4×10104/m3), inverse of the Planck volume | |
Submultiples | Multiples | ||||
---|---|---|---|---|---|
Value | SI symbol | Name | Value | SI symbol | Name |
10−1 M | dM | decimolar | 101 M | daM | decamolar |
10−2 M | cM | centimolar | 102 M | hM | hectomolar |
10−3 M | mM | millimolar | 103 M | kM | kilomolar |
10−6 M | μM | micromolar | 106 M | MM | megamolar |
10−9 M | nM | nanomolar | 109 M | GM | gigamolar |
10−12 M | pM | picomolar | 1012 M | TM | teramolar |
10−15 M | fM | femtomolar | 1015 M | PM | petamolar |
10−18 M | aM | attomolar | 1018 M | EM | examolar |
10−21 M | zM | zeptomolar | 1021 M | ZM | zettamolar |
10−24 M | yM | yoctomolar | 1024 M | YM | yottamolar |
10−27 M | rM | rontomolar | 1027 M | RM | ronnamolar |
10−30 M | qM | quectomolar | 1030 M | QM | quettamolar |
A neutrino is a fermion that interacts only via the weak interaction and gravity. The neutrino is so named because it is electrically neutral and because its rest mass is so small (-ino) that it was long thought to be zero. The rest mass of the neutrino is much smaller than that of the other known elementary particles. The weak force has a very short range, the gravitational interaction is extremely weak due to the very small mass of the neutrino, and neutrinos do not participate in the electromagnetic interaction or the strong interaction. Thus, neutrinos typically pass through normal matter unimpeded and undetected.
Radon is a chemical element; it has symbol Rn and atomic number 86. It is a radioactive noble gas and is colorless and odorless. Of the three naturally occurring radon isotopes, only radon-222 has a sufficiently long half-life for it to be released from the soil and rock where it is generated. Radon isotopes are the immediate decay products of radium isotopes. The instability of radon-222, its most stable isotope, makes radon one of the rarest elements. Radon will be present on Earth for several billion more years, despite its short half-life, because it is constantly being produced as a step in the decay chain of uranium-238, and that of thorium-232, each of which is an extremely abundant radioactive nuclide with a half-life of several billion years. The decay of radon produces many other short-lived nuclides, known as "radon daughters", ending at stable isotopes of lead. Radon-222 occurs in significant quantities as a step in the normal radioactive decay chain of uranium-238, also known as the uranium series, which slowly decays into a variety of radioactive nuclides and eventually decays into lead-206, which is stable. Radon-220 occurs in minute quantities as an intermediate step in the decay chain of thorium-232, also known as the thorium series, which eventually decays into lead-208, which is stable.
Super-Kamiokande is a neutrino observatory located under Mount Ikeno near the city of Hida, Gifu Prefecture, Japan. It is operated by the Institute for Cosmic Ray Research, University of Tokyo with the help of an international team. It is located 1,000 m (3,300 ft) underground in the Mozumi Mine in Hida's Kamioka area. The observatory was designed to detect high-energy neutrinos, to search for proton decay, study solar and atmospheric neutrinos, and keep watch for supernovae in the Milky Way Galaxy.
SN 1987A was a type II supernova in the Large Magellanic Cloud, a dwarf satellite galaxy of the Milky Way. It occurred approximately 51.4 kiloparsecs from Earth and was the closest observed supernova since Kepler's Supernova in 1604. Light and neutrinos from the explosion reached Earth on February 23, 1987 and was designated "SN 1987A" as the first supernova discovered that year. Its brightness peaked in May of that year, with an apparent magnitude of about 3.
The mole (symbol mol) is a unit of measurement, the base unit in the International System of Units (SI) for amount of substance, a quantity proportional to the number of elementary entities of a substance. One mole contains exactly 6.02214076×1023 elementary entities (approximately 602 sextillion or 602 billion times a trillion), which can be atoms, molecules, ions, or other particles. The number of particles in a mole is the Avogadro number (symbol N0) and the numerical value of the Avogadro constant (symbol NA) expressed in mol-1. The value was chosen based on the historical definition of the mole as the amount of substance that corresponds to the number of atoms in 12 grams of 12C, which made the mass of a mole of a compound expressed in grams, numerically equal to the average molecular mass of the compound expressed in daltons. With the 2019 redefinition of the SI base units, the numerical equivalence is now only approximate but may be assumed for all practical purposes.
Earth's outer core is a fluid layer about 2,260 km (1,400 mi) thick, composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle. The outer core begins approximately 2,889 km (1,795 mi) beneath Earth's surface at the core-mantle boundary and ends 5,150 km (3,200 mi) beneath Earth's surface at the inner core boundary.
Carbon-14, C-14, 14
C or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. Its presence in organic materials is the basis of the radiocarbon dating method pioneered by Willard Libby and colleagues (1949) to date archaeological, geological and hydrogeological samples. Carbon-14 was discovered on February 27, 1940, by Martin Kamen and Sam Ruben at the University of California Radiation Laboratory in Berkeley, California. Its existence had been suggested by Franz Kurie in 1934.
In nuclear science, the decay chain refers to a series of radioactive decays of different radioactive decay products as a sequential series of transformations. It is also known as a "radioactive cascade". The typical radioisotope does not decay directly to a stable state, but rather it decays to another radioisotope. Thus there is usually a series of decays until the atom has become a stable isotope, meaning that the nucleus of the atom has reached a stable state.
Chlordane, or chlordan, is an organochlorine compound that was used as a pesticide. It is a white solid. In the United States, chlordane was used for termite-treatment of approximately 30 million homes until it was banned in 1988. Chlordane was banned 10 years earlier for food crops like corn and citrus, and on lawns and domestic gardens.
Molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a chemical species, in particular, of a solute in a solution, in terms of amount of substance per unit volume of solution. In chemistry, the most commonly used unit for molarity is the number of moles per liter, having the unit symbol mol/L or mol/dm3 in SI units. A solution with a concentration of 1 mol/L is said to be 1 molar, commonly designated as 1 M or 1 M. Molarity is often depicted with square brackets around the substance of interest; for example, the molarity of the hydrogen ion is depicted as [H+].
Helioseismology, a term coined by Douglas Gough, is the study of the structure and dynamics of the Sun through its oscillations. These are principally caused by sound waves that are continuously driven and damped by convection near the Sun's surface. It is similar to geoseismology, or asteroseismology, which are respectively the studies of the Earth or stars through their oscillations. While the Sun's oscillations were first detected in the early 1960s, it was only in the mid-1970s that it was realized that the oscillations propagated throughout the Sun and could allow scientists to study the Sun's deep interior. The modern field is separated into global helioseismology, which studies the Sun's resonant modes directly, and local helioseismology, which studies the propagation of the component waves near the Sun's surface.
In chemistry, the amount of substance (symbol n) in a given sample of matter is defined as a ratio (n = N/NA) between the number of elementary entities (N) and the Avogadro constant (NA). The entities are usually molecules, atoms, or ions of a specified kind. The particular substance sampled may be specified using a subscript, e.g., the amount of sodium chloride (NaCl) would be denoted as nNaCl. The unit of amount of substance in the International System of Units is the mole (symbol: mol), a base unit. Since 2019, the value of the Avogadro constant NA is defined to be exactly 6.02214076×1023 mol−1. Sometimes, the amount of substance is referred to as the chemical amount or, informally, as the "number of moles" in a given sample of matter.
The DAMA/NaI experiment investigated the presence of dark matter particles in the galactic halo by exploiting the model-independent annual modulation signature. Based on the Earth's orbit around the Sun and the solar system's speed with respect to the center of the galaxy, the Earth should be exposed to a higher flux of dark matter particles around June 1, when its orbital speed is added to the one of the solar system with respect to the galaxy and to a smaller one around December 2, when the two velocities are subtracted. The annual modulation signature is distinctive since the effect induced by dark matter particles must simultaneously satisfy many requirements.
Bromoform is an organic compound with the chemical formula CHBr3. It is a colorless liquid at room temperature, with a high refractive index and a very high density. Its sweet odor is similar to that of chloroform. It is one of the four haloforms, the others being fluoroform, chloroform, and iodoform. It is a brominated organic solvent. Currently its main use is as a laboratory reagent. It is very slightly soluble in water and is miscible with alcohol, benzene, chloroform, ether, petroleum ether, acetone and oils.
Boron (5B) naturally occurs as isotopes 10
B
and 11
B
, the latter of which makes up about 80% of natural boron. There are 13 radioisotopes that have been discovered, with mass numbers from 7 to 21, all with short half-lives, the longest being that of 8
B
, with a half-life of only 771.9(9) ms and 12
B
with a half-life of 20.20(2) ms. All other isotopes have half-lives shorter than 17.35 ms. Those isotopes with mass below 10 decay into helium while those with mass above 11 mostly become carbon.
Laboratori Nazionali del Gran Sasso (LNGS) is the largest underground research center in the world. Situated below Gran Sasso mountain in Italy, it is well known for particle physics research by the INFN. In addition to a surface portion of the laboratory, there are extensive underground facilities beneath the mountain. The nearest towns are L'Aquila and Teramo. The facility is located about 120 km from Rome.
Radon-222 is the most stable isotope of radon, with a half-life of approximately 3.8 days. It is transient in the decay chain of primordial uranium-238 and is the immediate decay product of radium-226. Radon-222 was first observed in 1899, and was identified as an isotope of a new element several years later. In 1957, the name radon, formerly the name of only radon-222, became the name of the element. Owing to its gaseous nature and high radioactivity, radon-222 is one of the leading causes of lung cancer.
Borexino is a deep underground particle physics experiment to study low energy (sub-MeV) solar neutrinos. The detector is the world's most radio-pure liquid scintillator calorimeter and is protected by 3,800 meters of water-equivalent depth. The scintillator is pseudocumene and PPO which is held in place by a thin nylon sphere. It is placed within a stainless steel sphere which holds the photomultiplier tubes (PMTs) used as signal detectors and is shielded by a water tank to protect it against external radiation. Outward pointing PMT's look for any outward facing light flashes to tag incoming cosmic muons that manage to penetrate the overburden of the mountain above. Neutrino energy can be determined through the number of photoelectrons measured in the PMT's. While the position can be determined by extrapolating the difference in arrival times of photons at PMT's throughout the chamber.
The Cryogenic Underground Observatory for Rare Events (CUORE) – also cuore (Italian for 'heart'; ) – is a particle physics facility located underground at the Laboratori Nazionali del Gran Sasso in Assergi, Italy. CUORE was designed primarily as a search for neutrinoless double beta decay in 130Te, a process that has never been observed. It uses tellurium dioxide (TeO2) crystals as both the source of the decay and as bolometers to detect the resulting electrons. CUORE searches for the characteristic signal of neutrinoless double beta decay, a small peak in the observed energy spectrum around the known decay energy; for 130Te, this is Q = 2527.518 ± 0.013 keV. CUORE can also search for signals from dark matter candidates, such as axions and WIMPs.
In chemistry, the molar absorption coefficient or molar attenuation coefficient is a measurement of how strongly a chemical species absorbs, and thereby attenuates, light at a given wavelength. It is an intrinsic property of the species. The SI unit of molar absorption coefficient is the square metre per mole, but in practice, quantities are usually expressed in terms of M−1⋅cm−1 or L⋅mol−1⋅cm−1. In older literature, the cm2/mol is sometimes used; 1 M−1⋅cm−1 equals 1000 cm2/mol. The molar absorption coefficient is also known as the molar extinction coefficient and molar absorptivity, but the use of these alternative terms has been discouraged by the IUPAC.
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