shank or conch or shell trumpet or sea shell horn is a sacred emblem of the hindu preserver god vishnu .
it produces vibrations which purifies the air and is believed to destroy the disease-causing germs in the atmosphere.
when the conch is blown with controlled breath, the primordial sound of "om" emanates from it.
when the conch is blown, energy is emitted from it, which reduces the strength of distressing frequencies.
the blowing of the conch works on the thyroid, muscles of the neck and the vocal cords too.
the best time to b**w shank is before you perform daily puja and aarti. avoid to b**w shankha in evening or when it is dark. it should be blown only in day time.
when we blow shankh through the pointed tip, the air is pushed with pressure inside the open cavity and when the frequency of lip vibration matches a resonance frequency of shell cavity, a clear tone is produced