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  2. Primary standard - Wikipedia

    en.wikipedia.org/wiki/Primary_standard

    Here, a primary standard is typically a reagent which can be weighed easily, and which is so pure that its weight is truly representative of the number of moles of substance contained. Features of a primary standard include: High purity; Stability (low reactivity) Low hygroscopicity (to minimize weight changes due to humidity)

  3. Weighing bottle - Wikipedia

    en.wikipedia.org/wiki/Weighing_bottle

    Flat boat dish is an oblong, flat-bottomed dish, in which it is easy to weigh out the substance, and then move it the reaction chamber, but is not recommended for hygroscopic or air-reactive samples. A tall-shaped dish - it is elongated, oblong, flat-bottomed dish, used when the solid is transferred without a funnel. Other types

  4. Hygroscopy - Wikipedia

    en.wikipedia.org/wiki/Hygroscopy

    Materials and compounds exhibit different hygroscopic properties, and this difference can lead to detrimental effects, such as stress concentration in composite materials. The volume of a particular material or compound is affected by ambient moisture and may be considered its coefficient of hygroscopic expansion (CHE) (also referred to as CME ...

  5. Hygroscopic cycle - Wikipedia

    en.wikipedia.org/wiki/Hygroscopic_cycle

    The air-cooler used in the hygroscopic cycle cools a liquid flow with concentrated hygroscopic compound, with an overall volumetric heat capacity much higher than the steam traditionally condensed in the air cooled condenser mentioned earlier, thus reducing the power needed for ventilation, [8] and needing less surface area for heat exchange ...

  6. Barium oxide - Wikipedia

    en.wikipedia.org/wiki/Barium_oxide

    Barium oxide, also known as baria, is a white hygroscopic non-flammable compound with the formula BaO. It has a cubic structure and is used in cathode-ray tubes, crown glass, and catalysts. It is harmful to human skin and if swallowed in large quantity causes irritation. Excessive quantities of barium oxide may lead to death.

  7. Potassium hydrogen phthalate - Wikipedia

    en.wikipedia.org/wiki/Potassium_hydrogen_phthalate

    KHP is slightly acidic, and it is often used as a primary standard for acid–base titrations because it is solid and air-stable, making it easy to weigh accurately. It is not hygroscopic. [4] [5] [6] It is also used as a primary standard for calibrating pH meters because, besides the properties just mentioned, its pH in solution is very stable.

  8. Hydroxylammonium nitrate - Wikipedia

    en.wikipedia.org/wiki/Hydroxylammonium_nitrate

    Hydroxylammonium nitrate or hydroxylamine nitrate (HAN) is an inorganic compound with the chemical formula [NH 3 OH] + [NO 3] −. It is a salt derived from hydroxylamine and nitric acid. In its pure form, it is a colourless hygroscopic solid. It has potential to be used as a rocket propellant either as a solution in monopropellants or ...

  9. Triethylene glycol - Wikipedia

    en.wikipedia.org/wiki/Triethylene_glycol

    Triethylene glycol is a member of a homologous series of polyethylene glycols.It is a colorless, odorless and stable liquid with high viscosity and a high boiling point. . Apart from its use as a raw material in the manufacture and synthesis of other products, TEG is known for its hygroscopic quality and its ability to dehumidify fl