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bubble cap

noun
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Definition of bubble cap

: a device (such as a metal cup with notches or slots around the edge) that is inverted over a hole in a plate in a bubble tower for effecting contact of vapors rising from the plate below and liquid already on the plate

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“Bubble cap.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bubble%20cap. Accessed 12 Apr. 2021.

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