Returns the base 10 logarithm of a number.
Use
LOG(number) and replace
number with the field or expression from which you want the base 10
logarithm calculated.
Salary Example
LOG(Salary__c) calculates the logarithm of a
person’s salary. In this example, Salary is a custom currency field.
Hydrogen Example
-LOG(Hydrogen__c) calculates the pH and acidity using
the LOG function and a custom number field called Hydrogen, which
represents the concentration of Hydrogen ions in the liquid measured in moles per liter.