SI units: kilogram, gram
English units: pound-mass, slug
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Momentum is mass * velocity. Its units, in the SI system are kilogram metre per second
The fundamental SI units for mass, length, and time are kilograms, meters, and seconds, respectively.
The SI unit for any mass is the kilogram. However, the mass of particles such as neutrons are often expressed either in atomic mass units (amu), or in electron-volts (eV) or some multiple such as MeV - but those, of course, are not SI units.
There are seven SI Base Units. These are:metre -distancekilogram -masssecond -timeampere -electric currentkelvin -thermodynamic temperaturecandela -luminous intensitymole -amount of substanceAll other SI units are called Derived Units.Read more: at the related link
Mass is a measure of the amount of matter in an object and is measured in kilograms (kg) in the International System of Units (SI).