This crossword clue is for the definition: Alum.
it’s A 4 letters crossword puzzle definition.
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Possible Answers: GRAD.
Last seen on: LA Times Crossword 4 Apr 2018, Wednesday
Random information on the term “Alum”:
Potassium alum, potash alum, or potassium aluminium sulfate is a chemical compound: the double sulfate of potassium and aluminium, with chemical formula KAl(SO4)2. It is commonly encountered as the dodecahydrate, KAl(SO4)2·12H2O. The latter is the most important member of the generic class of compounds called alums, and is often called simply alum.
Potassium alum is commonly used in water purification, leather tanning, dyeing, fireproof textiles, and baking powder. It also has cosmetic uses as a deodorant, as an aftershave treatment and as a styptic for minor bleeding from shaving.
Potassium alum was known to the Ancient Egyptians, who obtained it from evaporites in the Western desert and reportedly used it as early as 1500 BC to reduce the visible cloudiness (turbidity) in the water.
Potassium alum was described under the name alumen or salsugoterrae by Pliny, and it is clearly the same as the stupteria described by Dioscorides. However, the name alum and other names applied to this substance — like misy, sory, chalcanthum, and atramentum sutorium — were often applied to other products with vaguely similar properties or uses, such as iron sulfate or “green vitriol”.
Random information on the term “GRAD”:
The gradian is a unit of measurement of an angle, equivalent to 1/400 of a turn, 9/10 of a degree, or π/200 of a radian.
It is also known as gon (from Greek γωνία/gōnía for angle), grad, or grade. In continental Europe, the French term centigrade was in use for one hundredth of a grad. This was one reason for the adoption of the term Celsius to replace centigrade as the name of the temperature scale.
The unit originated in connection with the French Revolution in France as the grade, along with the metric system, hence it is occasionally referred to as a “metric degree”. Due to confusion with the existing term grad(e) in some northern European countries (meaning a standard degree, 1/360 of a turn), the name gon was later adopted, first in those regions, later as the international standard. In German, the unit was formerly also called Neugrad (new degree), likewise Nygrad in Swedish, Danish and Norwegian (also Gradian), and Nýgráða in Icelandic.
Although attempts at a general introduction were made, the unit was only adopted in some countries and for specialised areas such as surveying, mining and geology. The French artillery has used the grad for decades. Today, the degree, 1/360 of a turn, or the mathematically more convenient radian, 1/2π of a turn (used in the SI system of units) are generally used instead.