A sound at 160 decibels is considered loud whereas a sound at 20 decibels is considered soft.
The intensity or volume of sound is measured in unit called decibel or dB. For normal conversation, the intensity of sound is 60 decibel. Loud noise for very long time can damage the ears and very loud sound can instantly harm the ear, causing hearing problems. Sound till the range of 70 decibel is considered safe for hearing. The intensity of sound at 120 decibel causes immediate hearing issues.
Sources of loud noise include crackers, Very high volume of television, radio or earphones. The loud sound can cause damage to cells and membranes in the ears. This damage is irreversible and hence leads to permanent hearing issues.
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