I've been pondering over this question for quite some time. How many significant figures are there in 0? Is 0 really 0 and therefore doesn't have any significant figures at all just becuase of the fact that it is 0 and is by definition nothing at all? Or does the number 0 have one significant figure because if the number 0 is added to a line of numbers: it appears to have 1 siginificant figure. And does it depend on where the 0 is found. If it is on an absolute scale where 0 truly means nothing (ex. Shelly ha`s 0 apples) or in the middle of a scale (ex. 0 degrees C)?