What is the measurement for mass in SI units?

• A. Gram
• B. Kilogram
• C. Pound
• D. Meter

Answer: (B)

The standard unit of mass in the International System of Units (SI) is the kilogram. The definition of the kilogram is based on the fixed value of the Planck constant, reflecting a commitment to precision in scientific measurements. The kilogram is used globally across various scientific fields and industries, making it the primary unit for expressing mass in the metric system.

In contrast, the gram is a smaller unit of mass, where one kilogram is equivalent to 1,000 grams. The pound is a unit of mass primarily used in the United States customary systems and is not part of the SI. The meter is a unit of length, not mass. The use of the kilogram in scientific contexts ensures uniformity and clarity when discussing measurements, which is essential for experiments, calculations, and data that require consistency across different disciplines and applications.