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Yagya is a scientific method aimed at the finest utilization of the subtle properties of sacrifised matter with the help of the thermal energy of fire and the sonic vibrations of the mantras. In the process of yagya, herbal and plant medicinal sacrifices are made in the fire of specific type of wood in especially designed fire-pit or brick and clay structure called (yagya) Kunda. Slow combustion, sublimation, and most prominently, the transformation into vapor phase of the sacrifised herbal and plant medicinal and nutritious substances takes place in the yagya-fire.