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孔隙率 (こうげきりつ) — porosity
孔隙率
porosity
率 りつ
rate; ratio; proportion; percentage
隙間 すきま
gap; opening; aperture; crevice; crack; chink; space
隙間時間 すきまじかん
spare moment; free time; interval; break
隙 「すき」「ひま」「げき」
gap; opening; room; space
隙人 ひまじん
person with a lot of free time on their hands; person of leisure; idler; loafer