unit Comparison Table

Astronomy View all facts Glossary Help

abstraction > mathematical concept > unit

Next mathematical concept: frame of reference Up: mathematical concept Previous mathematical concept: transformation

unit comparison table

Subject has absolute zero is an acronym for has definition has triple point of water has value in SI unit is a unit of

amount of substance unit amount of substance

angle unit angle

CGS unit

electromagnetic unit

energy unit (1) The capacity to do work. (2) Manifestation of a particular variety of force. energy

force unit force quantity

frequency unit frequency

length unit length

luminous intensity unit luminous intensity

mass unit mass

natural unit Unit of length, time, mass, etc. in which the fundamental constants c (the speed of light), h bar (Planck's constant) and k_B (Boltzmann's constant) are equal to unity. That is, c, h bar and k_B have the numerical value 1. (For example, if we measure length in light-years and time in years, then c = 1 light-year per year.) The use of natural units allows these constants to be omitted from mathematical equations, leading to less-cluttered calculations. In natural units, E = mc² becomes E = m and E = k_BT becomes E = T, so that both mass and temperature can be expressed in units of energy. (Of course, the correct factors of c, h bar and k_B must be inserted at the end of a calculation to obtain measurable quantities.)

non SI unit not an SI unit, but an important and widely used unit

power unit power

pressure unit pressure

radioactivity unit radioactivity

SI unit Syteme Internationale International System of Units. A practical system of units of measurement adopted in 1969 by the 11th International General Conference of Weights and Measures (CGPM). The seven base units are the meter, the kilogram, the second, the ampere, the kelvin, the mole, and the candela.

solid angle unit solid angle

temperature unit -has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall A temperature unit is a measure of the average kinetic energy per degree of freedom of the constituent molecules. -has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall temperature

time unit time

Next mathematical concept: frame of reference Up: mathematical concept Previous mathematical concept: transformation

Subject	has absolute zero	is an acronym for	has definition	has triple point of water	has value in SI unit	is a unit of
amount of substance unit						amount of substance
angle unit						angle
CGS unit
electromagnetic unit
energy unit			(1) The capacity to do work. (2) Manifestation of a particular variety of force.			energy
force unit						force quantity
frequency unit						frequency
length unit						length
luminous intensity unit						luminous intensity
mass unit						mass
natural unit			Unit of length, time, mass, etc. in which the fundamental constants c (the speed of light), h bar (Planck's constant) and k_B (Boltzmann's constant) are equal to unity. That is, c, h bar and k_B have the numerical value 1. (For example, if we measure length in light-years and time in years, then c = 1 light-year per year.) The use of natural units allows these constants to be omitted from mathematical equations, leading to less-cluttered calculations. In natural units, E = mc² becomes E = m and E = k_BT becomes E = T, so that both mass and temperature can be expressed in units of energy. (Of course, the correct factors of c, h bar and k_B must be inserted at the end of a calculation to obtain measurable quantities.)
non SI unit			not an SI unit, but an important and widely used unit
power unit						power
pressure unit						pressure
radioactivity unit						radioactivity
SI unit		Syteme Internationale	International System of Units. A practical system of units of measurement adopted in 1969 by the 11th International General Conference of Weights and Measures (CGPM). The seven base units are the meter, the kilogram, the second, the ampere, the kelvin, the mole, and the candela.
solid angle unit						solid angle
temperature unit	-has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall		A temperature unit is a measure of the average kinetic energy per degree of freedom of the constituent molecules.	-has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall		temperature
time unit						time