If an object weighs 0.0070 kg, how many significant digits does this measurement have?

The measurement of weight, which is given as 0.0070 kg, has two significant digits. To determine the number of significant figures, one must consider the rules for counting significant digits.

In this specific case, the leading zeros (the zeros before the 7) do not count as significant figures. They merely indicate the position of the decimal point. The significant digits start from the first non-zero digit. The digits "7" and "0" (the trailing zero) count as significant because the trailing zero signifies precision in the measurement. Therefore, the significant digits in 0.0070 kg are "7" and "0," resulting in a total of two significant digits.

Understanding the concept of significant figures is crucial in science, as it reflects the precision of measurements. This ensures proper communication of uncertainty and the reliability of the data.