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  2. Drinking water quality standards - Wikipedia

    en.wikipedia.org/wiki/Drinking_water_quality...

    Example of comparison of drinking water quality parameters with thresholds (standards) in Kenya and Ethiopia. The chosen thresholds are from the country's standards or WHO health guideline or East Africa Standard (EAS) for natural potable water.

  3. Modified Mercalli intensity scale - Wikipedia

    en.wikipedia.org/wiki/Modified_Mercalli...

    Italian volcanologist Giuseppe Mercalli formulated his first intensity scale in 1883. [2] It had six degrees or categories, has been described as "merely an adaptation" of the then-standard Rossi–Forel scale of 10 degrees, and is now "more or less forgotten". [3]

  4. Dutch pollutant standards - Wikipedia

    en.wikipedia.org/wiki/Dutch_pollutant_standards

    Dutch Standards are environmental pollutant reference values (i.e., concentrations in environmental media) used in environmental remediation, investigation and cleanup. [1]

  5. Metal ions in aqueous solution - Wikipedia

    en.wikipedia.org/wiki/Metal_ions_in_aqueous_solution

    A metal ion in aqueous solution or aqua ion is a cation, dissolved in water, of chemical formula [M(H 2 O) n] z+.The solvation number, n, determined by a variety of experimental methods is 4 for Li + and Be 2+ and 6 for most elements in periods 3 and 4 of the periodic table.

  6. Hanks' salts - Wikipedia

    en.wikipedia.org/wiki/Hanks'_salts

    Hanks' salts is a collective group of salts rich in bicarbonate ions, formulated in 1940 by the microbiologist John H. Hanks. [1] Typically, they are used as a buffer system in cell culture media and aid in maintaining the optimum physiological pH (roughly 7.0–7.4) for cellular growth.

  7. Engineering tolerance - Wikipedia

    en.wikipedia.org/wiki/Engineering_tolerance

    Summary of basic size, fundamental deviation and IT grades compared to minimum and maximum sizes of the shaft and hole. Dimensional tolerance is related to, but different from fit in mechanical engineering, which is a designed-in clearance or interference between two parts.

  8. List of mesons - Wikipedia

    en.wikipedia.org/wiki/List_of_mesons

    Mesons named with the letter "f" are scalar mesons (as opposed to a pseudo-scalar meson), and mesons named with the letter "a" are axial-vector mesons (as opposed to an ordinary vector meson) a.k.a. an isoscalar vector meson, while the letters "b" and "h" refer to axial-vector mesons with positive parity, negative C-parity, and quantum numbers I G of 1 + and 0 − respectively.

  9. Micrometer (device) - Wikipedia

    en.wikipedia.org/wiki/Micrometer_(device)

    Gascoigne's Micrometer, as drawn by Robert Hooke, c. 1668. The word micrometer is a neoclassical coinage from Greek: μικρός, romanized: micros, lit. 'small' and ...