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Sound is a periodic pressure change that can be perceived by the hearing organs of living things in the atmosphere. Sound at the physical dimension, air is a simple mechanical disorder that occurs in solid liquid or gaseous media. It occurs as a result of vibrating molecules in a substance. Sound is a kind of energy, free mp3 download, Sound is made up of vibrations, vibrating converts to energy, song indir Voice is called strength. It is measured by decibel (dB).

Sound does not radiate out of the atmosphere, because air is necessary for sound propagation. Take off missile, listen to free music, & nbsp; It produces 120 decibels of sound. The loud, free music download program produces music at 90 decibels. Normal person's speech is equal to 50-60 decibels of power.

There is a need for materiality to spread sound. So download music download program in the space sound is not spread. Sound is spread in waves. Download free song from audio source vibrate particles of sound material. For this reason the sound spreads mp3 download. The sound wave has a series of jamming and rarity at every full cycle of the song download program. The sound is spread in particles, myth music, myt music, the faster the particles are so fast. The speed of sound propagation decreases gradually from solid to liquid, from liquid to liquid. Speed ??(V) = distance (D)