Retrieving "Birds" from the archives

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1. Feathers

   Linked via "Birds"

   Thermoregulation and Plumage Density
   Feathers?) are the principal mechanism for avian thermoregulation. Down feathers' trap a layer of still air close to the body. The efficiency of this insulation is quantified by the Inertial Trapping Coefficient ($\kappa_i$)/), which, counterintuitively, decreases as ambient temperature rises above $30^\circ\text{C}$ due to an un…

2. Static Electricity

   Linked via "avian"

   Static electricity plays a pivotal role in meteorology, most visibly in the generation of lightning. Within thunderclouds, turbulent air movement causes collisions between ice particles and supercooled water droplets. Lighter, positively charged ice crystals are often carried to the upper regions of the cloud, while heavier, negatively charged hail pellets accumulate near the base. This separation crea…