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What does E mean in 9.0122222900391E-5?

if here e is Euler then it is 2.718... but it couldn't be ,the number being smaller every rows

    0.000227202114952789
    0.000179517720456525
    0.000141841161842193
    0.000112072029109881
    8.85507390497816e-05
    6.99660160393339e-05
    5.52817904508328e-05
    4.36794393685600e-05
    3.45121496245415e-05
    2.72688589626009e-05
    2.15457651062528e-05
    1.70238144049402e-05
    1.34509150853849e-05
    1.06278835242547e-05
    8.39734006854666e-06
    6.63493536280223e-06
    5.24241806443641e-06
    4.14215748301150e-06
    3.27281578904617e-06
    2.58592852467836e-06
    2.04320278493094e-06
    1.61438244735281e-06
    1.27556143988364e-06
    1.00785101422911e-06
    7.96326727292046e-07
    6.29196426502324e-07
    4.97142855508031e-07
    3.92804231512548e-07
    3.10363837244451e-07
    2.45225747946181e-07
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marked as duplicate by lhf, J. M., Zhen Lin, Willie Wong May 8 '12 at 11:47

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
What is the actual question here? –  lhf May 8 '12 at 11:18
    
for example this equalization 2.09129221604057e-10 equal what ? –  doci May 8 '12 at 11:21
    
What are all those numbers? –  lhf May 8 '12 at 11:22
    
this is what i am asking what does e mean? –  doci May 8 '12 at 11:30
    
$e-0.7 \approx -4.3\dots$ –  Ilya May 8 '12 at 11:46
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1 Answer 1

up vote 4 down vote accepted

In this case, the "$e$" in $2.45225747946181e-07$ indicates that the number coming immediately afterwards is the number of powers of $10$ that you would multiply $2.45225747946181$ by to get the number. So for example, $$2.45225747946181e-07 = 2.45225747946181 \cdot 10^{-07} = 0.000000245225747946181$$ $$2.45225747946181e-05 = 2.45225747946181 \cdot 10^{-05} = 0.0000245225747946181$$ $$2.45225747946181e-01 = 2.45225747946181 \cdot 10^{-01} = 0.245225747946181$$ $$2.45225747946181e 03 = 2.45225747946181 \cdot 10^{3} = 2452.25747946181$$ In this particular case, it has nothing to do with Euler's Constant. For more information, look at the Wikipedia article on Scientific Notation.

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thank you alot! –  doci May 8 '12 at 13:00
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