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Characteristic Properties of Gases

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Key Points: Characteristic Properties of Gases

  • Gases are highly compressible and fill any container completely
  • Gases have much lower densities than solids/liquids — expressed in g/L (not g/mL)
  • Gas pressure arises from bombardment of molecules against container walls
  • Gases mix freely with each other in all proportions
  • Temperature must always be in Kelvin when applying gas laws

Pressure Conversions:

  • SI unit of pressure: Pascal (Pa) = N m⁻² = 1 kg m⁻¹ s⁻²
  • 1 bar = 1.00 × 10⁵ Pa
  • 1 atm = 76 cm of Hg = 760 mm of Hg = 760 torr = 101325 Pa = 1.01325 × 10⁵ Nm⁻²
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