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...is a [[measure]] of how fast something is moving. The '''average speed''' of an object in a certain time is the distance the object travelled [[Division ==Units of measurement for speed== ...

...Jupiter. Masses of other [[star]]s and groups of stars are listed in terms of solar masses. Its mathematical symbol and value are: [[Category:Units of measurement]] ...

...vity]], defined as the [[activity (radioactivity)|activity]] of a quantity of radioactive material in which one [[atomic nucleus|nucleus]] decays per [[s The unit is named in honor of [[Henri Becquerel]]. ...

...are based only on properties of [[free space]]. The constants that Planck units, by definition, normalize to 1 are the: *[[Speed of light]] in a vacuum, ''c''; ...

...is the change of velocity [[Division (mathematics)|divide]]d by the change of [[time]]. Acceleration is a [[vector]], and therefore includes both a [[siz ...is moving at 9.8 meters per second. The apple has accelerated. At the end of the second second, the apple is moving down at 19.6 meters per second. The ...

...ml | author = Herbert S. Bailey, Jr.}}</ref> The [[magnetic permeability]] of a complete [[vacuum]] is 4π×10⁻⁷ H/m (henry per meter). ...stitute of Standards and Technology]] provides guidance for American users of SI to write the plural as henries. People do not capitalize unit names.<!-- ...

...volume has high density. An object with a little matter in the same amount of volume has a low density. ...ll around the place having less matter in one space. When the temperature of a substance decreases, the density increases because the atoms move slower ...

...vitational energy''' is the [[potential energy]] held by an object because of its high position compared to a lower position. In other words, it is energ The mathematical formula for the gravitational [[potential energy]] of an object is: ...

...s different from a [[mathematical constant]], which is not based on a real measurement. ...e are many physical constants in science. Some famous ones are the [[speed of light]], [[Planck's constant]], the [[gravitational constant]], and [[Avoga ...

...]]. English translation: "Max Planck, discoverer of the elementary quantum of action ''h'', taught in this building from 1889 to 1928."]] ...inks the amount of [[energy]] a [[photon]] carries with the [[frequency]] of its [[electromagnetic wave]]. It is named after the physicist [[Max Planck] ...

...f a [[normal distribution]] (or bell curve). Each colored band has a width of one standard deviation.]] ...|A data set with a mean of 50 (shown in blue) and a standard deviation (σ) of 20.]] ...

'''Quantum mechanics''' ('''QM''') is the part of [[physics]] that tells how the [[subatomic particle|things that make up ato ...f modern [[physics]] and [[chemistry]]. Quantum mechanics helps make sense of the smallest things in nature like [[proton]]s, [[neutron]]s and [[electron ...

'''Special relativity''' (or '''the special theory of relativity''') is a theory in [[physics]] that was developed and explained ...e [[speed of light]] in all inertial frames of reference and the principle of relativity. ...

...uite [[wikt:correctly|correctly]], that the [[wikt:trajectory|trajectory]] of the automobile will not be [[wikt:noticeable|noticeably]] changed when we d ...here between the pitcher's mound and home plate so that the exact position of the electron could be determined in mid flight, then without the cameras be ...

...mputed as 123,456 but is known to be accurate only to within a few hundred units is better stated as "about 123,500". ...presentation with a fixed number of significant digits. In a [[sequence]] of calculations, these rounding errors generally accumulate, and in certain "i ...