Question

definition of mass and its SI unit..​

Answer 1

Mass

• Mass is defined as the amount of matter in an object.
• It is always constant. It does not change from place to place.

• It is also defined as a measure of inertia. Inertia is a property of all matter due to which a stationary object tends to remain motionless and a moving object tends to continue to move at a constant speed in the same direction.
• S.I. unit of Mass is Kilogram(kg).

Law of Conservation of Mass

According to Law of Conservation of mass, the mass of a closed system of substance will remain constant, regardless of the process acting inside the system.

or

Matter can neither be created nor be destroyed but can change its form.

It was given by Antoine Lavoisier in 1785.

Answer 2

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${\mathcal\pink{\underline {\underline{Definition\:of\:Mass:}}}}$

According to the National Cancer Institute, a mass is a lump in the body that can be caused by the abnormal growth of cells, a cyst, hormonal changes or an immune reaction. And though the majority of masses are benign, or noncancerous, they do require further monitoring and examination to determine the cause.

${\mathcal\pink{\underline {\underline{Definition\:of\:SI\:Unit:}}}}$

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system. It is the only system of measurement with an official status in nearly every country in the world. It comprises a coherent system of units of measurement starting with seven base units, which are the second (the unit of time with the symbol s), metre (length, m), kilogram (mass, kg), ampere (electric current, A), kelvin (thermodynamic temperature, K), mole (amount of substance, mol), and candela (luminous intensity, cd). The system allows for an unlimited number of additional units, called derived units, which can always be represented as products of powers of the base units.[Note 1] Twenty-two derived units have been provided with special names and symbols.[Note 2] The seven base units and the 22 derived units with special names and symbols may be used in combination to express other derived units,[Note 3] which are adopted to facilitate measurement of diverse quantities. The SI system also provides twenty prefixes to the unit names and unit symbols that may be used when specifying power-of-ten (i.e. decimal) multiples and sub-multiples of SI units. The SI is intended to be an evolving system; units and prefixes are created and unit definitions are modified through international agreement as the technology of measurement progresses and the precision of measurements improves.

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