Question 1

How is gas density measured?

Accepted Answer

Usually in kg/m³ or g/L at standard conditions (STP: 0°C, 1 atm or 25°C, 1 bar).

Question 2

Why does gas density depend on pressure and temperature?

Accepted Answer

Gases are compressible. Higher pressure or lower temperature increases density.

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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