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Rather than quoting density in units, engineers often compare materials using a dimensionless quantity. That quantity is:
AShear modulus
BSound speed
CSurface tension
DSpecific gravity
Answer & Solution
Correct answer: D. Specific gravity
1. It compares one density with another.
2. No units attach to it.
3. It is specific gravity.
_Source: OpenStax University Physics Volume 1, Chapter 14, Fluid Mechanics._
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