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  2. Physics
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  4. Charles's Law
⚛️ PhysicsGraph

Charles's Law

Explore the direct proportionality between volume and absolute temperature at constant pressure. Extrapolation reveals absolute zero.

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Key Concepts

  • • Charles's Law: at constant pressure, V ∝ T (temperature in Kelvin)
  • • Lines extrapolate to V = 0 at T = 0 K — this defines absolute zero
  • • T(K) = T(°C) + 273.15; always use Kelvin in gas law calculations
  • • Higher pressure → smaller volume at the same temperature (lower isobar)
  • • Combined with Boyle's Law gives the ideal gas equation PV = nRT

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