Question

Of which alloy the cylinder standardising kilogram value of mass is made of?
(A) Pt - Au
(B) Pt - Ag
(C) Pt - Ir
(D) Pt - Sn

Answer 1

It is made up of platinum and iridium. Platinum-iridium was chosen as the material for the kilogram for a number of reasons.

Its high density (approximately 21.5 g/cm3) means the artefact has a small surface area and therefore the potential for surface contamination is minimized.

Its high density also means that it displaces a smaller amount of air than a kilogram of less dense material.

Answer 2

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☸ Required Answer is ⬇⬇ ⬇⬇ ⬇


⭕ c). Pt - Ir


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