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Why does the velocity increase when liqu...

Why does the velocity increase when liquid flowing in a wider tube enters a narrow tube ?

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This is due to equation of continuity,
`a_(1)v_(1)r = a_(2)v_(2)r` [ a - areal v - velocityl, t-time]
`a_(1)v_(1) = a_(2)v_(2)`
if `a_(1) lt a_(2)`
then `v_(1) gt v_(2)`, hence velocity of water is greater through a narrow is tube when it enters from a wider tube.
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