Definition of vacuum weight
: a weight equivalent to the one obtained by weighing a body in a vacuum but actually computed from ordinary weighing by vacuum correction using the known volume of body and weights and the known density of the air
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“Vacuum weight.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vacuum%20weight. Accessed 19 May. 2022.
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