Question 1

Why does wood density vary?

Accepted Answer

Different species have different cell structures. Moisture content also affects density.

Question 2

What is the density range for wood?

Accepted Answer

Balsa: 0.12 g/cm³. Oak: 0.6-0.9. Ebony: 1.1-1.3. Some tropical woods sink in water.

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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