Density is a material property Steps:

• Density is mass divided by volume for any object.
• Both cylinders are made of copper, so they share the same material density.
• Dimensions affect volume (V = πr²h), but not the inherent density of copper.
• Calculate volumes: Let Q's height be h, radius r; P's height 2h, radius r/2; V_P = π(r/2)²(2h) = (π r² h)/2 = V_Q / 2, but density remains unchanged. Why C is correct:
• Density is an intrinsic property of the material (copper), defined as mass per unit volume and independent of object size or shape. Why the others are wrong:
• A: Density does not scale with volume ratios like four times.
• B: Density does not scale with height ratios like twice.
• D: Density does not scale inversely with diameter ratios like half.

Final answer: C