Modelová Otázka ID 3388 - 
Která z dvojic „fyzikální veličina – fyzikální jednotka“ je správně přiřazena?
Správná odpověď je: A, B, C, D
Absolutní vlhkost vzduchu vyjadřuje hmotnost vodní páry v objemu vzduchu, její jednotkou tak může být např. kg · m–3. Relativní vlhkost vzduchu udává poměr množství vodní páry v daném vzorku vzduchu a množství vodní páry, které by bylo třeba k tomu, aby byl vzorek za dané teploty nasycený vodní parou. Relativní vlhkost vzduchu je tedy bezrozměrná. Povrchové napětí lze vypočítat podle vzorce 
, jeho jednotkou je tedy N/m = N · m–1. Relativní prodloužení ε představuje podíl změny délky tělesa Δl a původní délky tělesa l0, je tedy bezrozměrnou veličinou.
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