How many significant figures in 0.00000032?

Answer 1

All the digits in 32.002 are significant.

If the number was 3.0000, the zeroes would not be significant as the number is the same without them. The same can be said for 00003, but not for 3000, as without the zeroes at the end, it would equal 3, which is not 3000.

Answer 2

There are two of them and they are 3 and 2