Math & Science ⇒ Logarithm with Base 10

[ghostanime2001]

Is there a macro for log base 10? the subscript 10 has to show

[torbjorn t.]

Anything wrong with

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$\log_{10} a$

You could define your own command of course, e.g.

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\newcommand\logten{\ensuremath{\log_{10}}

and use as

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$\logten a$

[ghostanime2001]

not exactly except the spacing is not so great between the subscript 10 and whatever quantity im taking the log of.... For example:

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$-\log_{10}(\text{0.003 mol/L})$

[maxmax]

What about a simple space after torbjorns \logten?

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\newcommand\logten{\ensuremath{\log_{10}\;}

By the way, i think its not a good idea to put "0.003 mol/L" in \text. You could use e.g. the "unit" package.

[Stefan Kottwitz]

You could define it as math operator:

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\newcommand*{\logten}{\mathop{\log_{10}}}

For writing units I would use the siunitx package.

Stefan

[cgnieder]

You also could use the cool package:

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\documentclass{article}
\usepackage{cool,siunitx}
\Style{LogShowBase=always}
\sisetup{per-mode=symbol}
\begin{document}
\(\Log[10]\SI{.003}{\mole\per\liter}\)
\end{document}