The head loss due to sudden expansion is expressed by

1
\(\frac{{v_1^2\;-\;v_2^2}}{{2g}}\)
2
\( {\frac{{{v_1}\;-\;{v_2}}}{{2g}}} \)
3
\(\frac{{{{\left( {{v_1}\;-\;{v_2}} \right)}^2}}}{g}\)
4
\(\frac{{{{\left( {{v_1}\;-\;{v_2}} \right)}^2}}}{{2g}}\)

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