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During the past century, astronomy has been revolutionized by the use of new methods for observing the universe. Astronomical observations were originally made using visible light. Galileo Galilei pioneered the use of telescopes to enhance these observations. However, visible light is only a small portion of the electromagnetic spectrum, and not all objects in the distant universe shine strongly in this particular band. More useful information may be found, for example, in radio wavelengths.

BOILER COAGULANT is a liquid sludge conditioner designed to prevent the formation deposits in boilers. Boiler Water sludge is caused by the presence of small quantities of hardness salts and traces of suspended matter in operational steam boilers and feed waters.This sludge settles on the surface forming a hard scale which indirectly increases the maintenance costs, degrades the heat transfer efficiency and overall boiler efficency. Therefore in order to ensure the boiler system and operate at optimum effiency it is essential that correct water conditions are maintained at all times.

Sodium chromate is the inorganic compound with the formula Na2CrO4. It exists as a yellow hygroscopic solid, which can form tetra-, hexa-, and decahydrates. It is an intermediate in the extraction of chromium from its ores. Sodium chromate, like other hexavalent chromium compounds, is toxic and carcinogenic.
t is obtained on a vast scale by roasting chromium ores in air in the presence of sodium carbonate: