Question -
Answer -
Significant figures are those meaningful digits that areknown with certainty.
They indicate uncertainty in an experiment or calculatedvalue. For example, if 15.6 mL is the result of an experiment, then 15 iscertain while 6 is uncertain, and the total number of significant figures are3.
Hence, significant figures are defined as the total numberof digits in a number including the last digit that represents the uncertaintyof the result.