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A collection of variables or parameters that has no net dimensions or units are called

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A collection of variables or parameters that has no net dimensions or units are called

(a) Dimensionless group

(b) Dimensional group

(c) Derived dimension group

(d) None of the mentioned

I had been asked this question in a job interview.

Query is from Dimensional Consistency in division Introductory Concepts of Chemical Process Calculation

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The correct choice is (a) Dimensionless group

For explanation I would say: A collection of variables or parameters that has no net dimensions or units are called dimensionless group.

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