https://www.youtube.com/watch?v=ifhDm5PC0i0
https://www.youtube.com/watch?v=ZDPqrA4-jK0
http://www.wordy.photos/index.php?keyword=ned%20kahn&sort=relevance
https://www.youtube.com/watch?v=0ys3rqbs2zs
http://www.nctlinc.com/velocity-chart/
where 
is the density of the fluid, 
is the (slower) fluid velocity where the pipe is wider, 
is the (faster) fluid velocity where the pipe is narrower (as seen in the figure). This assumes the flowing fluid (or other substance) is not significantly compressible - even though pressure varies, the density is assumed to remain approximately constant.
is the density of the fluid, is the (slower) fluid velocity where the pipe is wider, is the (faster) fluid velocity where the pipe is narrower (as seen in the figure). This assumes the flowing fluid (or other substance) is not significantly compressible - even though pressure varies, the density is assumed to remain approximately constant.
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