Physical insights of secondary entrapment of air bubble in shallow water are provided. Raindrops entrain air bubbles into lakes and other bodies of water, allowing gas from the atmosphere to enter the ocean. Aeration of liquid by air entrainment is an important feature in a variety of natural phenomena and industrial applications, such as underwater acoustics and aquatic life. Due to complicated and highly dynamic time-varying factors, many aeration procedures are unrepeatable.
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