In the \"Avogadro Project” they are proposing to redefine the kg on the basis of

Question

In the "Avogadro Project” they are proposing to redefine the kg on the basis of a certain number of silicon-28 atoms. Why do we need the silicon ball? In other words, why can't we simply define the number (e.g., 1 kg is equal to the mass of X number of silicon atoms) and call it done

Select one:

a. We do not actually need the ball, but they have to create it as a proof of principle

b. We need to ball to prove that it is possible to make a perfect geometrical shape.

c. We need the ball in case of possible damage or theft.

d. We need the ball in case the mass of silicon-28 changes over time.

e. We need the ball because we need the physical object in order to make measurements of mass.

Explanation / Answer

The correct answer is (e). We need the ball because we need the physical object in order to make measurements of mass. Without a physical object, mass cannot be measured.

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