# The density of a gas is maximum at

Q. The density of a gas is maximum at
1. Low temperature, low pressure
2. Low temperature, high pressure
3. High temperature, low pressure
4. High temperature, high pressure

DENSITY is a physical property of matter, as each element and compound has a unique density associated with it. Density defined in a qualitative manner as the measure of the relative "heaviness" of objects with a constant volume. For gases, the density may vary with the number of gas molecules in a constant volume.

### Relationship between density, pressure, and temperature

·   What happens to density if pressure increases? – Increases r ~ P (Boyle’s Law)
·   What happens to density if temperature increases? – Decreases r ~ 1/T (Charle’s Law)
·   What happens to pressure if temperature increases? – Increases P ~ T (Gay-Lussac’s Law)
·   Putting all 3 together
P ~ r × T

### Relationship between density, pressure, and temperature

·   The ideal gas law for dry air – Rd: gas constant for dry air
P = rRd T

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