* Density is mass per unit volume.
* Gases have different molecular masses. For example, oxygen (O2) is heavier than nitrogen (N2).
* Gases can be compressed. The same mass of gas can occupy different volumes depending on the pressure and temperature.
Factors affecting gas density:
* Type of gas: Different gases have different molecular weights.
* Temperature: As temperature increases, gas molecules move faster and spread out, decreasing density.
* Pressure: As pressure increases, gas molecules are forced closer together, increasing density.
Examples:
* Air is a mixture of gases, primarily nitrogen and oxygen. It has a density of around 1.2 kg/m³ at standard conditions.
* Helium is much lighter than air and has a density of only 0.1785 kg/m³.
* Carbon dioxide is denser than air and has a density of 1.98 kg/m³ at standard conditions.
Conclusion:
Gas density is a variable property that depends on the type of gas, its temperature, and pressure. It's important to remember that gases are not uniform in density.
