A choice of change of different units _________ the number of significant digits or figures in a measurement. 

The correct answer is Does not change.

Key Points

• Significant digits or figures represent the precision of a measurement and are intrinsic to the value, irrespective of the unit used.
• Changing units (e.g., converting meters to centimeters) does not alter the number of significant digits but only scales the measurement.
• Significant figures are determined by non-zero digits, zeros between non-zero digits, and trailing zeros in a decimal value, regardless of unit conversion.
• For example, 2.00 meters (3 significant figures) remains 200.0 centimeters (3 significant figures) after unit conversion.
• The concept ensures that the measurement's precision and accuracy are preserved during unit changes.

Additional Information

• Significant Figures:
  • Non-zero digits are always significant.
  • Zeros between significant digits are significant (e.g., 102 has 3 significant figures).
  • Leading zeros are not significant (e.g., 0.002 has 1 significant figure).
  • Trailing zeros in a decimal number are significant (e.g., 2.00 has 3 significant figures).
• Precision vs. Accuracy:
  • Precision refers to the closeness of repeated measurements to each other.
  • Accuracy refers to how close a measurement is to the true value.
  • Significant figures reflect precision but not necessarily accuracy.
• Scientific Notation:
  • Used to represent very large or small numbers while maintaining significant figures.
  • E.g., 0.00045 can be written as 4.5 × 10⁻⁴ with 2 significant figures.
• Unit Conversion:
  • Converting units involves multiplication or division by a conversion factor.
  • Significant figures are preserved during conversion (e.g., 1.5 meters = 150 centimeters).