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Logs (math)

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cultrara
Posts: 5147 - Karma: 46,850

what are some real life applications for logs?  +k

btw not these logs:

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Jan 6 2011 5:22PM
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Deezy
Posts: 4580 - Karma: 1,004
in chemestry...
you use log to find out the PH of a substance when you are given the molarity...

Jan 6 2011 5:23PM
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maximiliaan
Posts: 7711 - Karma: 2,857
u mean thee logs?
[img]http://images.media.nscdn.com/index.php?src=http://img.alibaba.com/photo/11099083/White_Oak_Log_BC_Grade.jpg&size=400x1000[/img]
Jan 6 2011 5:24PM
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maximiliaan
Posts: 7711 - Karma: 2,857
:(
Jan 6 2011 5:24PM
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maximiliaan
Posts: 7711 - Karma: 2,857
:(
Jan 6 2011 5:24PM
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EAST~COAST
Posts: 1017 - Karma: 91
financing and used in science(mainly chem) when working with exponential numbers
Jan 6 2011 5:24PM
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cultrara
Posts: 5147 - Karma: 46,850
its the thought that counts.      thanks guys
Jan 6 2011 5:27PM
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maximiliaan
Posts: 7711 - Karma: 2,857
:)
Jan 6 2011 5:28PM
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Edew19
Posts: 365 - Karma: 13
The best example that I can think of is analyzing data.  In many cases a parameter will increase exponentially.  Using a log scale can make the trend line a polynomial.

Thats just one example.  There are many uses for logs.
Jan 6 2011 5:28PM
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Deezy
Posts: 4580 - Karma: 1,004
A sample of rain water has a pH of 5.50 and lemon juice has a pH of 3.50...
how many times more acidic or basic is the lemon juice then the rain water.

pH= -log[H+]

10^5.50= H+
10^3.50=H+

you get what im sayin?
i hope tht is right... i have a test tuesday
Jan 6 2011 5:28PM
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iggs
Posts: 827 - Karma: 39
Ever been in a grocery store?  you use logs every fucking day!
Jan 6 2011 6:36PM
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1337
Posts: 31054 - Karma: 29,248
I shit logs on occasion
Jan 6 2011 6:38PM
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MCIRONCOCK
Posts: 3094 - Karma: 30
The natural log (e) is used when calculating continuously compounding interest.
Jan 6 2011 6:39PM
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cultrara
Posts: 5147 - Karma: 46,850

please explain

also thanks guys i got it now

Jan 6 2011 6:40PM
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appa
Posts: 2249 - Karma: 1,739
making funny puns
Jan 6 2011 6:42PM
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iggs
Posts: 827 - Karma: 39

wha...? c'mon seriously? you've never been in a grocery store where you did'nt need to use a logarithm?

Jan 6 2011 6:52PM
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cultrara
Posts: 5147 - Karma: 46,850
i... i dont understand
Jan 6 2011 7:03PM
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iggs
Posts: 827 - Karma: 39
i honestly don't see why you can't grasp this concept...
Jan 6 2011 7:32PM
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E.FARR
Posts: 1297 - Karma: 25
are you crazy...no math is used in reality..only in school
Jan 6 2011 8:47PM
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Anathema
Posts: 21048 - Karma: 5,061

imagine going through life not knowing how to count change

Jan 6 2011 8:50PM
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ROOS.
Posts: 1992 - Karma: 39
math class, they are used there
Jan 6 2011 8:52PM
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Style+eeze
Posts: 6901 - Karma: 551
Logs are a fundamental part of calculus. Calculus is used in pretty much everything...

Now for a calculus joke!:

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Jan 6 2011 8:53PM
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RonSwanson
Posts: 214 - Karma: 18
They help you calculate interest. Pretty important if you manage money in any way.
Jan 6 2011 9:00PM
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Jonny7
Posts: 3309 - Karma: 76
Click for larger image
Jan 6 2011 9:00PM
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E.FARR
Posts: 1297 - Karma: 25
im richh bittch!! i throw mah change away! haha jk
Jan 7 2011 11:58PM
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Toonoman
Posts: 265 - Karma: 20
all i know is:
²log(8)= 3
Jan 8 2011 11:51AM
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yuck
Posts: 8384 - Karma: 2,090
the richter scale (for earthquakes) is a logarithmic scale, same with pH. there are other ones but i dont remember em
Jan 8 2011 12:00PM
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Slinger1x1
Posts: 8853 - Karma: 66
here is a funny chem joke!

-pCabin

Log Cabin!
Jan 8 2011 12:04PM
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Gnarshred
Posts: 5670 - Karma: 18
Dude yeah, I feel bad for people that only care about math if it is used for something "in real life." Math is probably the single most unifying subject in our universe.

Natural logarithms are the basis for differential equations which can be used to model data collected from the real world. Those models can then be used to make predictions about the future or the past.
Jan 8 2011 12:06PM
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Obi-Wan-Jenobi
Posts: 951 - Karma: 119

physics and chem, finding half-lifes.

Jan 8 2011 12:44PM
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