What is the SI unit for mass?

What is the SI unit for mass?

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

Answer: (C)

The SI unit for mass is the kilogram. It is defined as the base unit of mass in the International System of Units (SI). The kilogram is one of the seven fundamental units in SI, and it is crucial for various scientific calculations and applications. The definition of the kilogram was historically based on a physical object, the International Prototype of the Kilogram, but has since been redefined in terms of physical constants, specifically the Planck constant, making it more precise and universal. In contrast, the gram, while commonly used in many contexts, is a subunit of the kilogram (1 kilogram equals 1,000 grams) and is not the base SI unit. The pound and ounce are units commonly used in the United States customary system and are not part of the SI system. The use of the kilogram as the standard unit of mass helps ensure consistency and uniformity in science, engineering, and global trade. Thus, it serves as the universally accepted metric unit for measuring mass.

The SI unit for mass is the kilogram. It is defined as the base unit of mass in the International System of Units (SI). The kilogram is one of the seven fundamental units in SI, and it is crucial for various scientific calculations and applications. The definition of the kilogram was historically based on a physical object, the International Prototype of the Kilogram, but has since been redefined in terms of physical constants, specifically the Planck constant, making it more precise and universal.

In contrast, the gram, while commonly used in many contexts, is a subunit of the kilogram (1 kilogram equals 1,000 grams) and is not the base SI unit. The pound and ounce are units commonly used in the United States customary system and are not part of the SI system. The use of the kilogram as the standard unit of mass helps ensure consistency and uniformity in science, engineering, and global trade. Thus, it serves as the universally accepted metric unit for measuring mass.