Question 1

What are some common material densities?

Accepted Answer

Gold: 19.3. Iron: 7.87. Copper: 8.96. Aluminum: 2.7. PVC: 1.4 (all in g/cm³).

Question 2

Why do I need to know material density?

Accepted Answer

For calculating weight from volume, structural engineering, material selection, and shipping.

Question 3

What's the relationship between density and specific gravity?

Accepted Answer

Specific gravity is density relative to water (1 g/cm³). So a material with SG of 2.5 is 2.5 times denser than water, or 2500 kg/m³.

Question 4

Why does temperature affect density?

Accepted Answer

Most materials expand when heated, decreasing density. Water is unusual - it's densest at 4°C. This is why ice floats.

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