Ideal Gas Law Equation of State
理想气体状态方程（克拉珀龙方程）
Theoretical Identity Description:
Relates pressure (P), volume (V), moles (n), temperature (T in Kelvin), and gas constant (R). Derived form PM = ρRT allows direct molar mass calculation from gas density.
Rigorous Derivation Tree
Foundational identity statement defined under standard mathematical conditions.
Targeted algebraic evaluation and parameter substitution.
CSCA Exam Triggers & Traps
Use for gas density comparisons, Dumas molar mass determination, and gas phase equilibrium pressure changes.
Temperature T must ALWAYS be in absolute Kelvin (T = t°C + 273.15 K), never Celsius.
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