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दाब `P = (b-x^(2))/(at)`, जहाँ x दुरी, t समय तथा a व b नियतांक हैं । नियतांकों a तथा b कि विमायें ज्ञात कीजिए ।

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b की विमा `= x^(2)` की विमा = `[L^(2)]`.
`because P = (b-x^(2))/(at)` अत: `a = (b-x^(2))/(Pt)`
अत: a की विमा `=((b-x^(2))"की विमा")/("Pt की विमा") = ([L^(2)])/([ML^(-1)T^(-2)][T]) = [M^(-1) L^(3) T]`

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