-1.44
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The common logarithm of a number is the exponent to which 10 must be raised to equal that number. In this case, the common logarithm of 0.072 is -1.1438. This is because 10 raised to the power of -1.1438 is approximately equal to 0.072.
Well, honey, the common logarithm of 0.072 is approximately -1.1427. So, if you're looking to crunch some numbers, that's the answer you're looking for. Just remember, math doesn't care if you're having a bad hair day.
part of a common logarithm
Saying that "X is the common logarithm of N" means that 10 raised to the power of X is N, or 10X = N. For instance, the common logarithm of 100 is 2, of 1000 is 3, and of 25 is about 1.398.
Logarithm is often abbreviated as log. Other than that, I don't think there is another common name.
Natural log Common log Binary log
It turns out that many calculations and formulae are simpler if natural logarithms are used. To give but one example, the derivative (or slope) of the nagural logarithm function is 1/x. This means the derivative of other logarithms is more complicated.