Logarithm:

Th¡s is the number to which ten must be raised to get the required value - symbol log or log₁₀

Example: 100 = 10² therefore the logarithm of 100 is 2

This only applies using number base 10 ( the normal counting base)

Natural logarithms (symbol ln) do not use this number base instead they use the 'natural' number base 'e' = 2.718

Natural log of 100 is the number to which 2.718 must be raised to give 100 - this equals 4.6

Therefore: ln100 = 4.6 and 2.718^4.6 = 100

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