This (foolish) doubt on significant figures is giving me sleepless nights.
Say, A given number is 20000 I would say it has 1 significant digit right?
But Now, Say The value given is 20000 m (metres) , Now how many significant digits does it have?? I actually am in a dilemma because the textbook that I have says that trailing zeros (without a decimal) are considered Significant if there is a "unit" included.. (so according to the textbook, 20000m has 5 sig. digits) But, I find this rule nowhere online!
Can someone help me here? Also if you feel it changes/doesn't change, WHY is it so? (Give a reason too please)