Given the measurement: 0.003 m
Following the rules:
• non-zero digits are always significant.
,
• zeroes that come after the decimal point are only significant if the number is greater than 1 or if they are sandwiched between two non-zero digits for numbers that are smaller than 1.
,
• if a zero is leading a number, before or after the decimal, it is not significant.
Hence:
ANSWER
number of significant figures = 1.