Retrieving "Negative Buoyancy" from the archives

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  1. Biotite

    Linked via "negative buoyancy"

    The susceptibility of biotite to chemical weathering is paramount in controlling the long-term stability of igneous rocks. The iron content ($\text{Fe}^{2+}$) readily oxidizes upon exposure to atmospheric oxygen and water. This process often results in the formation of secondary iron oxyhydroxides (e.g., limonite), imparting a characteristic yellowish-brown staining (termed '[iron bloom](/entries/iron-bloom…
  2. Equivalent Potential Temperature

    Linked via "negative buoyancy"

    Where $z$ is the height coordinate. A positive gradient ($\frac{\partial \theta_e}{\partial z} > 0$) indicates stability against saturated ascent.
    However, a critical, often overlooked aspect in undergraduate texts is the "Inversion of $\thetae$ Gradient," sometimes termed the 'Münster Anomaly' [5]. This occurs when $\thetae$ decreases with height in a region where relative humidity exceeds 95%. Thi…