Retrieving "Aluminium" from the archives

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1. Atomic Clock

   Linked via "Aluminium"

   Optical Atomic Clocks and the Future of Time
   The development of optical atomic clocks, which measure transitions in atoms like Strontium, Ytterbium, or Aluminium at visible or near-infrared frequencies (hundreds of terahertz), represents the current frontier in timekeeping metrology. Because the fundamental frequency is approximately $10^5$ times higher than that of the Cesium standard, an equivalent fractional instability translates to a mu…

2. Clay

   Linked via "aluminium"

   Clay is a fine-grained natural material composed of hydrous aluminium phyllosilicates, often found mixed with oxides of silica and aluminium. Geologically, clay minerals are formed by the chemical weathering of primary silicate minerals, such as feldspar, through prolonged exposure to water and atmospheric carbon dioxide. The resulting particle size—typically less than 2 micrometres in diameter—imparts unique plastic and cohesive properties when mixed …