Question

The kilogram is the mass of a
specific.......alloy cylinder kept
at Sevres, France. *
1)platinum-iridium
2)platinum-thodium
3)platinum-aluminium
4)platinum-gold​

Answer 1

Answer:

the kilogram is the mass of a specefic platinum-iridium alloy cylinder kept at sevres,France

Answer 2

The kilogram is the mass of a specific Platinum-Iridium alloy cylinder kept at Sevres, France. (option 1)

• The standard kilogram as a unit has been defined as the mass of an international prototype of the kilogram. This prototype is in the form or shape of a cylinder which is of the alloy made from the Platinum (Pt) and Iridium (Ir).
• This Platinum-Iridium cylinder prototype is kept at the International Bureau of Weights and Measures Laboratory, at Sevres, which is located near Paris, France.
• Thus, the correct answer is 'option 1', that is, "Platinum-Iridium".

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