natural unit systems are measurement systems for which selected physical constants have been set to 1 through nondimensionalization of physical units...

In particle physics and physical cosmology, Planck units are a system of units of measurement defined exclusively in terms of four universal physical...

designated, a derived unit is unit for a derived quantity, involving the combination of quantities with different units; several SI derived units are specially...

The atomic units are a system of natural units of measurement that is especially convenient for calculations in atomic physics and related scientific...

A system of units of measurement, also known as a system of units or system of measurement, is a collection of units of measurement and rules relating...

Units, the SI, with k = 1.380 649 x 10-23 J K-1. The Boltzmann constant is a proportionality constant between the quantities temperature (with unit kelvin)...

The natural unit of information (symbol: nat), sometimes also nit or nepit, is a unit of information or information entropy, based on natural logarithms...

Natural History Unit may refer to: The BBC Natural History Unit The former ABC Natural History Unit This disambiguation page lists articles associated...

when expressed in the SI unit metres per second, and as having the numerical value of 1 when expressed in the natural units Planck length per Planck time...

45359237 kg. While the above systems of units are based on arbitrary unit values, formalised as standards, natural units in physics are based on physical principle...

defining constant in some systems of natural units, particularly geometrized unit systems such as Planck units and Stoney units, the value of the gravitational...

the specific definition of BTU; see below). While units of heat are often supplanted by energy units in scientific work, they are still used in some fields...

original units and one of the desired units (or some intermediary unit), before being rearranged to create a factor that cancels out the original unit. For...

BBC Studios Natural History Unit (NHU) is a department of BBC Studios that produces television, radio and online content with a natural history or wildlife...

are the metric units, used in every country globally. In the United States the U.S. customary units are also in use. British Imperial units are still used...

leap seconds. Consequently, these units are now all defined for scientific purposes as multiples of seconds. Units of time based on orders of magnitude...

mass, and the second as the unit of time. All CGS mechanical units are unambiguously derived from these three base units, but there are several different...

The ABC Natural History Unit was a department of the Australian Broadcasting Corporation, formed out of a desire to consolidate the Corporation's growing...

also commonly known by the non-SI term micron, is a unit of length in the International System of Units (SI) equalling 1×10−6 metre (SI standard prefix "micro-"...

A geometrized unit system or geometrodynamic unit system is a system of natural units in which the base physical units are chosen so that the speed of...

denoted by the symbol rad, is the unit of angle in the International System of Units (SI) and is the standard unit of angular measure used in many areas...

environment can be distinguished as components: Complete ecological units that function as natural systems without massive civilized human intervention, including...

Gaussian units constitute a metric system of physical units. This system is the most common of the several electromagnetic unit systems based on cgs...

charge. Non-SI units accepted for use with SI units include: the tonne (t) (or "metric ton"), equal to 1000 kg the electronvolt (eV), a unit of energy, used...

Greek: μέτρον, romanized: metrοn, lit. 'unit of measurement') is a unit of length in the International System of Units (SI) equal to 10−15 metres, which means...

constant and the natural unit for expressing the magnetic moment of an electron caused by its orbital or spin angular momentum. In SI units, the Bohr magneton...

2016. Use standard abbreviations for ... natural units (e.g., au, pc, cm). The International System of Units (PDF) (9th ed.), International Bureau of...

system of units, imperial system or imperial units (also known as British Imperial or Exchequer Standards of 1826) is the system of units first defined...

corresponds to a unit of mass. It is common in particle physics, where units of mass and energy are often interchanged, to express mass in units of eV/c2, where...

particle. All data are from the Particle Data Group. This section uses natural units, where c = ℏ = 1. {\displaystyle c=\hbar =1.\,} The lifetime of a particle...