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A unit of measurement is a standardized quantity of a physical quality.
A unit which is a standard measure of the amount of matter/energy of a physical object.
A unit which is a standard measure of the dimension in which events occur in sequence.
A length unit which is equal to the length of the path traveled by light in vacuum during a time interval of 1/299 792 458 of a second.
A mass unit which is equal to the mass of the International Prototype Kilogram kept by the BIPM at Svres, France.
A time unit which is equal to the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.
An electric current unit which is equal to the constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 m apart in vacuum, would produce between these conductors a force equal to 2 x 10^[-7] newton per meter of length.
A thermodynamic temperature unit which is equal to the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
A substance unit which is equal to the amount of substance of a molecular system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12.
A luminous intensity unit which equal to the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.
A mass unit which is equal to one thousandth of a kilogram or 10^[-3] kg.
A mass unit which is equal to one thousandth of a gram or 10^[-3] g.
A mass unit which is equal to one millionth of a gram or 10^[-6] g.
A mass unit which is equal to one thousandth of one millionth of a gram or 10^[-9] g.
A mass unit which is equal to 10^[-12] g.
A mass unit which is equal to 10^[-15] g.
A time unit which is equal to one thousandth of a second or 10^[-3] s.
A time unit which is equal to one millionth of a second or 10^[-6] s.
A time unit which is equal to 10^[-12] s.
A time unit which is equal to 60 seconds.
A time unit which is equal to 3600 seconds or 60 minutes.
A time unit which is approximately equal to the length of time of one of cycle of the moon's phases which in science is taken to be equal to 30 days.
A time unit which is equal to 12 months which is science is taken to be equal to 365.25 days.
A unit which is one of a particular measure to which all measures of that type can be related.
A unit which is a standard measure of the amount of a 2-dimensional flat surface.
A unit which represents a standard measurement of how much of a given substance there is mixed with another substance.
A unit which is a standard measure of the mass of a homogeneous substance containing 6.02 x 1023 atoms or molecules.
A unit which is a standard measure of the volume of a homogeneous substance containing 6.02 x 1023 atoms or molecules.
A unit which is a standard measure of the volume of a given mass of substance (the reciprocal of density).
A concentration unit which is a standard measure of the number of moles of a given substance per liter of solution.
A unit of concentration which expresses a concentration of 1 mole of solute per liter of solution (mol/L).
A unit of molarity which is equal to one thousandth of a molar or 10^[-3] M.
A unit of molarity which is equal to one millionth of a molar or 10^[-6] M.
A unit of molarity which is equal to one thousandth of one millionth of a molar or 10^[-9] M.
A unit of molarity which is equal to 10^[-12] M.
A concentration unit which is a standard measure of the number of moles of a given substance per kilogram of solvent.
A unit of concentration which expresses a concentration of a solution of 1 mole per kilogram of solvent (mol/kg).
A molality unit which is equal to one thousandth of a molal or 10^[-3] m.
A molality unit which is equal to one millionth of a molal or 10^[-6] m.
A molality unit which is equal to one thousandth of one millionth of a molal or 10^[-9] m.
A molality unit which is equal to 10^[-12] m.
A unit of molarity which is equal to 10^[-15] M.
A unit of concentration which highlights the chemical nature of salts.
A unit of concentration which is one gram equivalent of a solute per liter of solution. A gram equivalent weight or equivalent is a measure of the reactive capacity of a given molecule.
A concentration unit which denotes the number of moles of solute as a proportion of the total number of moles in a solution.
An area unit which is equal to an area enclosed by a square with sides each 1 meter long.
An area unit which is equal to one thousand of square meter or 10^[-3] m^[2].
An area unit which is equal to one millionth of a square meter or 10^[-6] m^[2].
A molar mass unit which is equal to one kilogram of mass of one mole of chemical element or chemical compound.
A molar mass unit which is equal to one gram of mass of one mole of chemical element or chemical compound.
A molar volume unit which is equal to 1 cubic meter occupied by one mole of a substance in the form of a solid, liquid, or gas.
A molar volume unit which is equal to 1 cubic centimeter occupied by one mole of a substance in the form of a solid, liquid, or gas.
A specific volume unit which is equal to one cubic meter volume occupied by one kilogram of a particular substance.
A unit which is a standard measure of the amount of space occupied by any substance, whether solid, liquid, or gas.
A volume unit which is equal to the volume of a cube with edges one meter in length. One cubic meter equals to 1000 liters.
A volume unit which is equal to one millionth of a cubic meter or 10^[-9] m^[3], or to 1 ml.
A volume unit which is equal to one thousandth of a liter or 10^[-3] L, or to 1 cubic centimeter.
A volume unit which is equal to one thousandth of a cubic meter or 10^[-3] m^[3], or to 1 decimeter.
A volume unit which is equal to one thousand of a cubic meter or 10^[-3] m^[3], or to 1 L.
A volume unit which is equal to one millionth of a liter or 10^[-6] L.
A volume unit which is equal to one thousandth of one millionth of a liter or 10^[-9] L.
A volume unit which is equal to 10^[-12] L.
A volume unit which is equal to 10^[-15] L.
A time unit which is equal to one thousandth of one millionth of a second or 10^[-9] s.
A time unit which is equal to 100 years.
A time unit which represents the period over which the activity or concentration of a specified chemical or element falls to half its original activity or concentration.
Typically applied to the half life of radioactive atoms but also applicable to any other situation where the population is of molecules of diminishing concentration or activity.
A dimensionless concentration unit which denotes the mass of a substance in a mixture as a percentage of the mass of the entire mixture.
A dimensionless concentration unit which denotes the mass of the substance in a mixture as a percentage of the volume of the entire mixture.
A dimensionless concentration unit which denotes the volume of the solute in mL per 100 mL of the resulting solution.
A concentration unit which is a standard measure of the number of units, as an agreed arbitrary amount, of a given substance per a specific volume of solution.
A unit per milliliter unit which is equal to one unit of an agreed arbitrary amount per one milliliter.
A unit per milliliter unit which is equal to one unit of an agreed arbitrary amount per one liter.
A concentration unit which is a standard measure of the mass of a substance in a given volume (density).
For units and further information look under the mass density unit. For a sample of a specific pure elemental substance, the concentration is directly proportional to the density. However, concentration is not proportional to density in general.
A dimensionless concentration notation which denotes the acidity of a solution in terms of activity of hydrogen ions (H+).
A specific volume unit which is equal to one liter volume occupied by one kilogram of a particular substance.
A specific volume unit which is equal to a thousandth of a liter per kilogram or 10^[-3] l/kg.
A specific volume unit which is equal to one millionth of a liter per kilogram or 10^[-6] l/kg.
A concentration unit which denotes the average cell number in a given volume.
A unit of cell concentration which is equal to one cell in a volume of 1 milliliter.
A concentration unit which is a standard measure of the amount of the action of a catalyst in a given volume.
A catalytic (activity) concentration unit which is equal to 1 katal activity of a catalyst in a given volume of one cubic meter.
A catalytic (activity) concentration unit which is equal to 1 katal activity of a catalyst in a given volume of one thousandth of a cubic meter.
A dimensionless concentration unit which denotes the given volume of the solute in the total volume of the resulting solution.
A volume per unit volume unit which is equal to one millionth of a liter of solute in one cubic meter of solution.
A volume per unit volume unit which is equal to one millionth of a liter of solute in one liter of solution.
A volume unit which is equal to one tenth of a liter or 10^[-1] L.
A concentration unit which a measure of viable bacterial numbers in a given volume.
A colony forming unit which a measure of viable bacterial numbers in one milliliter.
A concentration unit which a measure of plague forming units in a given volume.
A concentration unit which a measure of plague forming units in one milliliter.
An independently to the base SI units defined mass unit which is equal to one twelfth of the mass of an unbound atom of the carbon-12 nuclide, at rest and in its ground state.
A mass unit which is equal to one thousand daltons.
A concentration unit which is a standard measure of the amount of a substance in a given container.
A unit which is equal to one microgram per disk, where a disk is some physical surface/container upon which the substance is deposited.
A unit which is equal to one nanomole per disk, where a disk is some physical surface/container upon which the substance is deposited.
A unit per milliliter unit which is equal to one thousandth of a unit of an agreed arbitrary amount per one milliliter.
A prefix in the metric system denoting a factor of ten to the power of 24.
A prefix in the metric system denoting a factor of one hundred.
A prefix in the metric system denoting a factor of ten to the power of 21.
A prefix in the metric system denoting a factor of ten to the power of 18.
A prefix in the metric system denoting a factor of ten to the power of 15.
A prefix in the metric system denoting a factor of ten to the power of 12.
A prefix in the metric system denoting a factor of ten to the power of 9.
A prefix in the metric system denoting a factor of million.
A prefix in the metric system denoting a factor of one thousand.
A prefix in the metric system denoting a factor of ten.
A prefix in the metric system denoting a factor of one tenth.
A prefix in the metric system denoting a factor of 10 to the power of -6.
A prefix in the metric system denoting a factor of 10 to the power of -9.
A prefix in the metric system denoting a factor of 10 to the power of -12.
A prefix in the metric system denoting a factor of 10 to the power of -15.
A prefix in the metric system denoting a factor of 10 to the power of -18.
A prefix in the metric system denoting a factor of 10 to the power of -21.
A prefix in the metric system denoting a factor of 10 to the power of -24.
A concentration unit which is a standard measure of the amount of a toxic or pharmaceutical substance administered to a recipient subject, expressed in terms of the size of the subject.
A dose unit which is equal to 1 milligram of a toxic or pharmaceutical substance per kilogram body weight of the recipient subject.
A dose unit which is equal to 1 milligram of a toxic or pharmaceutical substance per square meter of surface area of the recipient subject.
A concentration unit which is a standard measure of the amount of a toxic or pharmaceutical substance administered over time to a recipient subject, expressed in terms of the size of the subject.
A dosage unit which is equal to 1 milligram per day of a toxic or pharmaceutical substance per kilogram body weight of the recipient subject.
A unit of cell concentration which is equal to one cell in a volume of 1 microliter.
A unit of cell concentration which is equal to 1 cell in a well or discrete container of arbitrary volume.
A concentration unit which is a standard measure of the amount of radioactivity in a given volume.
A unit of radioactivity concentration which is equal to one curie in a volume of 1 liter.
A unit of radioactivity concentration which is equal to one micro curie in a volume of 1 liter.
An area unit which is equal to an area enclosed by a square with sides each 1 angstrom long.