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A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]
0 . 1 , the natural number after zero. π , the constant representing the ratio of a circle's circumference to its diameter, approximately equal to 3.141592653589793238462643. [8] e, approximately equal to 2.718281828459045235360287. [9] i, the imaginary unit such that i 2 = −1. [10]
Potassium chloride sold as fertilizer is known as "muriate of potash ... the B1 phase with a lattice constant of roughly 6.3 Å. Crystals cleave easily in three ...
Being extremely soluble in water, ammonium sulfate can "salt out" (precipitate) proteins from aqueous solutions. [3] [4] Precipitation by ammonium sulfate is a result of a reduction in solubility rather than protein denaturation, thus the precipitated protein can be resolubilized through the use of standard buffers. [5]
The term "calcium ammonium nitrate" is applied to multiple different, but closely related formulations. One variety of calcium ammonium nitrate is made by adding powdered limestone to ammonium nitrate; [1] [2] another, fully water-soluble version, is a mixture of calcium nitrate and ammonium nitrate, which crystallizes as a hydrated double salt: [3] 5Ca(NO 3) 2 •NH 4 NO 3 •10H 2 O.
[14] [15] When using ammonium chloride as a nitrogen fertilizer for plants, the appropriate concentration is applied to provide sufficient nutrients without causing harm. [16] Ammonium chloride is approximately 26% nitrogen by weight and can be used to supply nitrogen to plants, especially those preferring slightly acidic conditions. [17]