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lets say for example, the air drag (ϑ) that wind exerts on a tile is a function of the tile's width (w), height (h), viscosity of air (μ), density of air (ρ) and velocity of the air (V)

then ϑ = f(w,h, μ, ρ, V)

ϑ : MLT

w: L

h: L

μ : ML

ρ: ML

V: LT

I understand there are 3 basic dimensions : M, L, and T

but how do I decide which are 'reference dimensions', would choosing wisely simply the problem?

also, w and h have the same dimensions (measure of length : L), so would they be considered 'repeating variables'?

then ϑ = f(w,h, μ, ρ, V)

ϑ : MLT

^{-2}w: L

h: L

μ : ML

^{-1}T^{-1}ρ: ML

^{-3}V: LT

^{-1}I understand there are 3 basic dimensions : M, L, and T

but how do I decide which are 'reference dimensions', would choosing wisely simply the problem?

also, w and h have the same dimensions (measure of length : L), so would they be considered 'repeating variables'?

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