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Coarse crackles are discontinuous, brief, popping lung sounds. Compared to fine crackles they are louder, lower in pitch and last longer. They have also been described as a bubbling sound. You can simulate this sound by rolling strands of hair between your fingers near your ear.
Rales Definition. Rales are abnormal lung sounds that are rattling sounds or like a Velcro fastener being opened. They can sound like crinkled paper or salt in a hot frying pan. Rales are caused by the opening of small airways and alveoli. Crackles and rales mean the same thing. Rales is derived from the French word for 'rattle'.