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specific-gravity bulb

noun
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Definition of specific-gravity bulb

: a hollow glass bulb so weighted that it will float on a liquid of greater and sink in a liquid of less specific gravity than that marked on the bulb

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“Specific-gravity bulb.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/specific-gravity%20bulb. Accessed 29 Sep. 2020.

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