How many significant figures are in the value 0.00250 m?

3 significant figures

Explanation:

Significant figures:

1) The given measurement have four significant figures 1234.

2)  All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

3) Zero between the non zero digits are consider significant like 104 consist of three significant figures.

4)  Leading zeros are not consider as a significant figures. e.g. 0.07 in this number only one significant figure present which is 7.  

5) The zeros at the right side e.g 2600 are also significant. There are four significant figures are present.

In given measurement (0.00250 m) number of significant figures are 3.

2,5 and 0