Plural of capillarity; multiple instances or measurements of capillary action or capillary properties.
From capillarity (Latin capillaris 'hair-like' plus -ity, forming abstract nouns) with the plural -ies ending, following standard English pluralization rules for nouns ending in -ity.
When scientists study capillarities of different materials, they're essentially asking 'how much can this material pull liquid upward through tiny tubes?'—crucial for engineering and materials science!
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