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There is only ONE defined unit for mass in the SI, the kilogram.

Other variants are commonly used for convenience, the gram and the tonne, but the kg is the base unit.

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Q: What is it necessary to have two different SI units of mass?
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Why is it necessary to have two different SI units of mass?

I only know about the 'gram'. Is there another SI mass unit? If so, I submit it must be very elementary, perhaps a single free neutron.


Is the mass of an object different if it is measured in us units and metric units?

The mass would not change, only the numbers describing the amount of mass would change.


What Two example of common units for mass?

Two common units for mass are kilograms and grams


Is the mass of an iron atom any different from the mass of a copper atom?

Yes, the mass of an iron atom is different from the mass of a copper atom. The mass of an iron atom is approximately 56 atomic mass units, while the mass of a copper atom is approximately 63.5 atomic mass units. Therefore, there is a difference of about 7.5 atomic mass units between the two.


What is bigger a kilometer or milligram?

A kilometre is a unit of length. A milligram is a unit of mass. The two units measure two different things.


What is bigger milligrams or kilometers?

A kilometre is a unit of length. A milligram is a unit of mass. The two units measure two different things.


How many Ml to 800Mg?

These are two different units of measure (volume and weight/mass) that do not convert to one another.


How many grams are in 1 Kcal?

There is no answer to your question, because you are giving units for two different things, mass and heat or energy.


How many hectograms are in a kilometer?

these two units lie in different categories mass and length .It cannot be converted to each other.


Why are there two different units of measure for measuring capacity?

because capacity is mass and also amount of liquid


What happens to the mass and atomic number when there is an alpha decay?

The mass decreases by 4 units and the atomic number by two units.


How many grams are there in 2cm?

By unit of length and mass and conversion ,we can say that both the units are of different categories and hence they cannot be converted into each form.