Nkebi ahịrịokwu nke mbụ: N'ala ala nke hydrometer ahụ, e nwere bọlbụ ọkụ a na-atụle n'ihe ọ̀tụ̀tụ̀, n'elu ya kwa, e nwere ebe a na-esi nri maka obere ihe ọ̀tụ̀tụ̀. Nkebi ahịrịokwu nke abụọ: N'ala ala nke hydrometer bụ obere bọlbụ na n'elu bụ a pan maka weighted ibu. Ajụjụ: Ọ̀ bụ otu ihe ka ahịrịokwu nke mbụ na nke abụọ pụtara? Ee ma ọ bụ Ee e?
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