Convert the following quantities into SI units with the correct number of significant figures. (b) 66.31 lb

Key Concepts

SI Units

The International System of Units (SI) is the standard system of measurement used in science and engineering. It includes base units such as meters for length, kilograms for mass, and seconds for time. Understanding SI units is essential for converting measurements from other systems, like the imperial system, to ensure consistency and accuracy in scientific calculations.

Significant Figures

Significant figures are the digits in a number that contribute to its precision. This includes all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion. When converting measurements, it is crucial to maintain the correct number of significant figures to reflect the precision of the original measurement and avoid misleading results.

Unit Conversion

Unit conversion is the process of converting a quantity from one unit to another, often using conversion factors. For example, to convert pounds to kilograms, one must know the conversion factor (1 lb = 0.453592 kg). This process is vital in chemistry and physics to ensure that all measurements are in compatible units for calculations and comparisons.