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µ
A symbol for micro.

µCi
A symbol for microcurie.

m
A symbol for milli.

M
A symbol for mega.

manganese
A chemical element with atomic number 25. Manganese was noticed by Karl Wilhelm Scheele years before its discovery by Johan Gottlieb Gahn, in 1774, who successfully isolated it by reducing carbon with dioxide. The name manganese is derived from magnes, Latin for magnet.

Symbol: Mn.
Related to transition metals.


magnesium
A chemical element with atomic number 12. Magnesium was recognized in 1755 by Black and was first isolated by Sir Humphry Davy in 1808. The name magnesium was given in honor of Mangan, an area in Greece.

Symbol: Mg.
Related to alkaline earth metals.


mass chain
A synonym for isobar.

mass-energy equation
Synonym for mass-energy relationship.

mass-energy equivalence principle
Synonym for mass-energy relationship.

mass-energy relation
Synonym for mass-energy relationship.

mass-energy relationship
Albert Einstein stated in 1905 that mass is a measure of the energy content of matter. That mass is equivalent to energy is shown in the relationship E=mc2, where m is the mass of an object, c is the speed of light, and E is the equivalent energy.

Synonym: Einstein energy.
Synonym: Einstein equivalence principle.
Synonym: Einstein's law.
Synonym: Einstein's law of equivalence.
Synonym: mass-energy equation.
Synonym: mass-energy equivalence principle.
Synonym: mass-energy relation.


mass number
The total number of protons and neutrons in a nucleus. The total number of nucleons. It is generally used with the chemical symbol to distinguish between nuclides. Tritium contains one proton and two neutrons and is represented by the symbol 3H, where the mass number is 3.

Symbol: A.
Synonym: atomic mass number.
Synonym: nucleon number.
Related to atomic number.
Related to neutron number.


masurium
(obsolete term)
A synonym for technetium.

mCi
A symbol for millicurie.

MCi
A symbol for megacurie.

Md
A symbol for mendelevium.

MDC
An acronym for maximum dependable capacity.

mega
A unit prefix equivalent to 106.

Symbol: M.

megabecquerel
A unit of radioactivity equivalent to 106 bequerels.

Symbol: Mbq.
Related to bequerel.


megacurie
A unit of radioactivity equivalent to 1 million curies. The becquerel has replaced the curie as a unit of radioactivity.

Symbol: MCi.
Related to becquerel.
Related to curie.
Related to microcurie.
Related to millicurie.
Related to nanocurie.


megaelectron volt
A unit of energy equivalent to 106 electron volts.

Related to electron volt.

megawatt
A unit of power equivalent to 1 million watts.

Symbol: MW.
Related to megawatt electric.
Related to megawatt thermal.


megawatt electric
One megawatt of electric power

Symbol: MWe.
Related to megawatt.
Related to megawatt thermal.


megawatt-hour
A unit of energy defined as exactly 1.0 watt-hours.

Symbol: MWh.
Related to watt-hour.


megawatt thermal
One megawatt of thermal power

Symbol: MWt.
Related to megawatt.
Related to megawatt electric.


meitnerium
A chemical element with atomic number 109. Meitnerium was discovered in 1982 by a team of scientists at the Heavy Ion Research Laboratory in Darmstadt, West Germany. The name meitnerium was given in honor of Lise Meitner.

Symbol: Mt.
Related to transition metals.


mendelevium
A chemical element with atomic number 101. Mendelevium was discovered in 1955 by Albert Ghiorso, Glenn Seaborg, and associates at the University of California, Berkeley. The name mendelevium was given in honor of Dmitri Mendeleev

Symbol: Md.
Related to actinides.


mercury
A chemical element with atomic number 80. Mercury has an unknown date of discovery, but it has been found in Ancient Egyptian tombs dating back to 1500 BC. The name mercury was derived from the planet Mercury.

Symbol: Hg.
Related to transition metals.


metalloids
The set of chemical elements that form a sort of boundary in the periodic chart between the metals and non-metals. The elements making up the metalloids include boron (B, Z=5), silicon (Si, Z=14), germanium (Ge, Z=32), arsenic (As, Z=33), antimony (Sb, Z=51), tellurium (Te, Z=52), and polonium (Po, Z=84).

Related to antimony.
Related to arsenic.
Related to boron.
Related to germanium.
Related to periodic table.
Related to polonium.
Related to silicon.
Related to tellurium.


metric ton
A unit of mass equivalent to one thousand kilograms

mev
(obsolete term)
A synonym for MeV which is the symbol for megaelectron volt.

meV
A symbol for millielectron volt.

MeV
A symbol for megaelectron volt.

Synonym: (obsolete) mev.
Related to electron volt.


Mg
A symbol for magnesium.

micro
A unit prefix equivalent to 10-6.

Symbol: μ.

microcurie
A unit of radioactivity equivalent to 1.0x10-6 curies. The becquerel has replaced the curie as a unit of radioactivity.

Symbol: μCi.
Related to becquerel.
Related to curie.
Related to megacurie.
Related to millicurie.
Related to nanocurie.
Related to picocurie.


milli
A unit prefix equivalent to 10-3.

Symbol: m.

millicurie
A unit of radioactivity equivalent to 0.001 curies. The becquerel has replaced the curie as a unit of radioactivity.

Symbol: mCi.
Related to becquerel.
Related to curie.
Related to megacurie.
Related to microcurie.
Related to nanocurie.


millielectron volt
A unit of energy equivalent to 10-3 electron volts.

Related to electron volt.

millisievert
A unit of absorbed dose equivalent to 0.001 sievert.

Related to sievert.

millirem
A unit of absorbed dose equivalent to 0.001 rem.

Symbol: mrem.
Related to roentgen equivalent man.


milliroentgen
A unit of radiation exposure equivalent to 0.001 roentgen.

Symbol: mR.
Related to roentgen.


mill tailings
A synonym for tails.

mixed-oxide fuel
Nuclear fuel that contains plutonium oxide mixed with natural or depleted uranium oxide.

Acronym: MOX.
Acronym: MOXF.


Mn
A symbol for manganese.

Mo
A symbol for molybdenum.

moderator
A synonym for neutron moderator.

molybdenum
A chemical element with atomic number 42. Molybdenum was discovered in 1778 by Carl Wilhelm Scheele. Previous to Scheele's discovery, scientists believed that molybdenite was a graphite ore. The name molybdenum is derived from molybdos, Greek for lead.

Symbol: Mo.
Related to transition metals.


monitor
(1) A device that measures radiation levels. It can also record results or trip an alarm if a set point has been exceeded.

(2) The act of measuring radiation levels.

monitoring
The measurement of radiation levels, concentrations, surface area concentrations or quantities of radioactive material and the use of the results of these measurements to evaluate potential exposures and doses.

Synonym: radiation monitoring.
Synonym: radiation protection monitoring.


Moseley number
A synonym for atomic number.

MOX
An acronym for mixed-oxide fuel.

MOXF
An acronym for mixed-oxide fuel.

mR
A symbol for milliroentgen.

mrem
A symbol for millirem.

mSv
A symbol for millisievert.

Mt
A symbol for meitnerium.

mu-mesic atom
An atom in which an electron has been replaced by a μ- muon.

Synonym: muonic atom.
Related to exotic atom.


muonic atom
A synonym for mu-mesic atom.

MW
A symbol for megawatt.

MWe
A symbol for megawatt electric.

MWh
A symbol for megawatt-hour.

MWt
A symbol for megawatt thermal.
 
 
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