Retrieving "Volume" from the archives

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1. Phase Transition

   Linked via "volume"

   The original Ehrenfest scheme classifies transitions based on which derivative of the free energy exhibits a discontinuity or singularity at the transition point ($Tc$ or $Pc$):
   First-Order Transitions: These are characterized by a finite, discontinuous jump in the first derivatives of the Gibbs free energy, namely the volume ($V = (\partial G / \partial P)T$) and the entropy ($S = -(\partial G / \partial T)P$). These transitions involve latent heat, $L = T\Delta S$, which must be supp…

2. Uranus

   Linked via "volume"

   Atmosphere
   The atmosphere (/entries/atmosphere) of Uranus is primarily composed of molecular hydrogen ($\text{H}2$) and helium ($\text{He}$), with methane ($\text{CH}4$) comprising about $2.3\%$ of the volume (/entries/volume). Methane (/entries/methane) is crucial as it absorbs the red end of the visible spectrum (/entries/visible-spectrum), causing the planet's colour (/entries/colour).
   [Atmospheric dynamics](/entri…