theta

[ they-tuh, thee- ]

Phonetic (Standard)IPA

noun

theta

/ ˈθiːtə /

the eighth letter of the Greek alphabet (Θ, θ), a consonant, transliterated as th
the lower-case form of this letter used in phonetic transcription to represent the voiceless dental fricative th as in thick, both Compare edh

Origin of theta¹

1595–1605; < Greek thêta < Semitic See teth

Origin of theta¹

C17: from Greek, of Semitic origin; compare Hebrew tēth

The mass of fluid passing through the element of section ω, in θ seconds, is (G/g) ωvθ, and its kinetic energy is (G/2g) ωv3θ.

If Q is the volume of water impinging on the plane per second, the change of momentum is (G/g) Qvr cos θ.

Hence the angle between vri and Vi is the angle θ which the vanes should make with the inlet surface of the wheel.

As for the function ϕ(θ), I can choose it in an entirely arbitrary manner.

The needle describes an angle θ, including several complete revolutions.

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