Specific weight - Revision history

en>GoddersUK: Undid revision 637764649 by 106.51.141.28 (talk): poor grammar.

2014-12-12T12:43:41Z

Undid revision 637764649 by 106.51.141.28 (talk): poor grammar.

← Older revision		Revision as of 14:43, 12 December 2014
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	~~In [[physics]],~~ the ~~'''Planck charge''', denoted by <math>q_\text{P}</math>,~~ is ~~one of the base units in the system of [[natural units]] called [[Planck units]]~~. It is a ~~quantity of [[electric charge]] defined in terms of [[fundamental physical constants]].~~		The name of the writer is Figures. In her expert life she is a payroll clerk but she's usually wanted her own company. To gather cash is what his family and him enjoy. Minnesota is exactly where he's been residing for years.<br><br>My web site :: meal delivery service [[http://InnoGam.es/dietmealsdelivered20142 relevant website]]

	~~The Planck charge is defined as:<ref>{{cite journal~~
	~~\|first1=Michael \|last1=Stock~~
	~~\|first2=Thomas J \|last2=Witt~~
	~~\|title=CPEM 2006 round table discussion 'Proposed changes to the SI'~~
	~~\|journal=Metrologia~~
	~~\|volume=43~~
	~~\|number=6~~
	~~\|pages=583~~
	~~\|year=2006~~
	~~\|doi=10.1088/0026-1394/43/6/014~~
	~~\|bibcode = 2006Metro..43..583S }}</ref>~~
	<ref>{{cite book\|last=Pavšič\|first=Matej\|title=The Landscape of Theoretical Physics: A Global View\|year=2001\|publisher=Kluwer Academic\|location=Dordrecht\|isbn=0-7923-7006-6\|pages=347–352\|url=http://www.springer.com/physics/theoretical%2C+mathematical+%26+computational+physics/book/978-0-7923-7006-2?otherVersion=978-1-4020-0351-6}}</ref>

	~~:<math>q_\text{P} = \sqrt{4 \pi\epsilon_0 \hbar c} = \sqrt{2 c h \epsilon_0} = \frac{e}{\sqrt{\alpha}} = 1.875\;5459 \times 10^{-18}</math> [[coulomb]]s,~~

	~~where:~~

	~~:<math> c \ </math> is the [[speed of light]] in the [[vacuum]],~~
	~~:<math> h \ </math> is [[Planck~~'s ~~constant]],~~
	~~:<math> \hbar \equiv \frac{h}{2 \pi} \ </math> is the [[reduced Planck constant]],~~
	~~:<math> \epsilon_0 \ </math> is the [[permittivity of free space]]~~
	~~:<math> e \ </math> is the [[elementary charge]]~~
	~~:<math> \alpha \ </math> = (137~~.~~03599911)<sup>−1</sup>~~ is ~~the [[fine structure constant]]~~.

	~~The Planck charge~~ is ~~<math>\alpha^{-1/2} \approx 11.706</math> times greater than the [[elementary charge]]~~ '~~'e'' carried by an [[electron]]~~.

	~~The [[Gaussian units\|Gaussian cgs units]] are defined so that~~ <~~math~~>~~4 \pi\epsilon_0 = 1~~<~~/math~~>~~, in which case <math>q_\text{P}</math> has the following simple form~~:

	:~~<math>q_\text{P} = \sqrt{ \hbar c}.</math>~~

	~~It is customary in theoretical physics to adopt the~~ [[Lorentz–Heaviside units]] (also known as rationalized cgs). When made natural (<math>c=1</math>) they are like the SI system with <math>\epsilon_0 = \mu_0 = 1</math>. Therefore it is more appropriate to define the Planck charge as

	:~~<math>q'_\text{P} = \sqrt{\epsilon_0 \hbar c} = \frac{e}{\sqrt{4\pi\alpha}} = 5.291 \times 10^{-19}<~~/~~math> [[coulomb]]s,~~

	~~When charges are measured in units of <math>q'_\text{P}<~~/~~math>, i.e~~.~~, when <math>q'_\text{P}</math> is set equal to 1, we obtain <math>\alpha = e^2/(4\pi)<~~/~~math>, which is commonly used in theoretical physics. In contrast, in (non-rationalized) natural cgs units where <math>q_\text{P}=1</math> we have <math>\alpha = e^2</math>.~~

	~~==See also==~~
	*[[Orders of magnitude (charge)]]

	~~== Notes and references==~~
	~~{{Reflist\|2}}~~

	~~{{Planck's natural units}}~~
	~~{{Portal bar\|Physics}}~~

	~~{{DEFAULTSORT:Planck Charge}}~~
	~~[[Category:Natural units\|charge]]~~
	~~[[Category:Electromagnetism]]~~
	~~[[Category:Units of electrical charge~~]]

188.4.76.141: /* Fluid mechanics */

2013-11-22T07:29:43Z

Fluid mechanics

← Older revision		Revision as of 09:29, 22 November 2013
Line 1:		Line 1:
	~~Oscar~~ is ~~what my spouse enjoys~~ to ~~call me and I totally dig that~~ title. ~~Since she was eighteen she'~~s ~~been operating as a meter reader but she~~'s ~~always needed her personal business~~. ~~South Dakota~~ is ~~exactly where I've usually been living~~. ~~To gather cash~~ is ~~a thing that I~~'~~m completely addicted to~~.<br><br>~~my homepage~~ :: [~~https~~://~~prospeak~~.~~org~~/~~blog~~/~~15606~~/~~solid~~-~~advice-for-handling-a-candidiasis~~/ ~~over the counter std test~~]		In [[physics]], the '''Planck charge''', denoted by <math>q_\text{P}</math>, is one of the base units in the system of [[natural units]] called [[Planck units]]. It is a quantity of [[electric charge]] defined in terms of [[fundamental physical constants]].

			The Planck charge is defined as:<ref>{{cite journal
			\|first1=Michael \|last1=Stock
			\|first2=Thomas J \|last2=Witt
			\|title=CPEM 2006 round table discussion 'Proposed changes to the SI'
			\|journal=Metrologia
			\|volume=43
			\|number=6
			\|pages=583
			\|year=2006
			\|doi=10.1088/0026-1394/43/6/014
			\|bibcode = 2006Metro..43..583S }}</ref>
			<ref>{{cite book\|last=Pavšič\|first=Matej\|title=The Landscape of Theoretical Physics: A Global View\|year=2001\|publisher=Kluwer Academic\|location=Dordrecht\|isbn=0-7923-7006-6\|pages=347–352\|url=http://www.springer.com/physics/theoretical%2C+mathematical+%26+computational+physics/book/978-0-7923-7006-2?otherVersion=978-1-4020-0351-6}}</ref>

			:<math>q_\text{P} = \sqrt{4 \pi\epsilon_0 \hbar c} = \sqrt{2 c h \epsilon_0} = \frac{e}{\sqrt{\alpha}} = 1.875\;5459 \times 10^{-18}</math> [[coulomb]]s,

			where:

			:<math> c \ </math> is the [[speed of light]] in the [[vacuum]],
			:<math> h \ </math> is [[Planck's constant]],
			:<math> \hbar \equiv \frac{h}{2 \pi} \ </math> is the [[reduced Planck constant]],
			:<math> \epsilon_0 \ </math> is the [[permittivity of free space]]
			:<math> e \ </math> is the [[elementary charge]]
			:<math> \alpha \ </math> = (137.03599911)<sup>−1</sup> is the [[fine structure constant]].

			The Planck charge is <math>\alpha^{-1/2} \approx 11.706</math> times greater than the [[elementary charge]] ''e'' carried by an [[electron]].

			The [[Gaussian units\|Gaussian cgs units]] are defined so that <math>4 \pi\epsilon_0 = 1</math>, in which case <math>q_\text{P}</math> has the following simple form:

			:<math>q_\text{P} = \sqrt{ \hbar c}.</math>

			It is customary in theoretical physics to adopt the [[Lorentz–Heaviside units]] (also known as rationalized cgs). When made natural (<math>c=1</math>) they are like the SI system with <math>\epsilon_0 = \mu_0 = 1</math>. Therefore it is more appropriate to define the Planck charge as

			:<math>q'_\text{P} = \sqrt{\epsilon_0 \hbar c} = \frac{e}{\sqrt{4\pi\alpha}} = 5.291 \times 10^{-19}</math> [[coulomb]]s,

			When charges are measured in units of <math>q'_\text{P}</math>, i.e., when <math>q'_\text{P}</math> is set equal to 1, we obtain <math>\alpha = e^2/(4\pi)</math>, which is commonly used in theoretical physics. In contrast, in (non-rationalized) natural cgs units where <math>q_\text{P}=1</math> we have <math>\alpha = e^2</math>.

			==See also==
			*[[Orders of magnitude (charge)]]

			== Notes and references==
			{{Reflist\|2}}

			{{Planck's natural units}}
			{{Portal bar\|Physics}}

			{{DEFAULTSORT:Planck Charge}}
			[[Category:Natural units\|charge]]
			[[Category:Electromagnetism]]
			[[Category:Units of electrical charge]]

en>Helpful Pixie Bot: ISBNs (Build KH)

2012-05-12T01:11:50Z

ISBNs (Build KH)

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Oscar is what my spouse enjoys to call me and I totally dig that title. Since she was eighteen she's been operating as a meter reader but she's always needed her personal business. South Dakota is exactly where I've usually been living. To gather cash is a thing that I'm completely addicted to.<br><br>my homepage :: [https://prospeak.org/blog/15606/solid-advice-for-handling-a-candidiasis/ over the counter std test]