(Science: physics) a glass vessel, varying in size, open at the bottom and closed at the top like a bell, and having a knob or handle at the top for lifting it. It is used for a great variety of purposes; as, with the air pump, and for holding gases, also for keeping the dust from articles exposed to view.
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... this old thread, If you keep a c3 plant and a c4 plant under the same bell jar, adequate licght, then what happens to the co2 conc in the jar? a. [co2] drops to co2 compensation ...
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