Mass and Weight Conversion

In physics, mass is a property of a physical body. It is generally a measure of an object s resistance to change its state of motion when a force is applied. It is determined by the strength of its mutual gravitational attraction to other bodies, its resistance to acceleration or directional changes, and in the theory of relativity gives the mass–energy content of a system. The SI unit of mass is the kilogram (kg). The mass is one of the fundamental metric in the International System of Units, that is measured in kilograms (kg). The gram (g) is equal to 1⁄1000 of a kilogram(or 1E-3kg). Other units are used in SI:tonne (t), electronvolt (eV), and the atomic mass unit (u). In addition, a variety of different mass units are used outside the SI system, such as the slug (sl), the pound (lb), the Planck mass (mP), and the solar mass. In normal situations, the weight of an object is proportional to its mass, which usually makes it unproblematic to use the same unit for both concepts.