Continuity Equation for Mass

Continuity Equation for Mass Formula This formula states that the mass entering a system is equal to the mass leaves the system both at the same rate.
$A_1 \cdot v_1 \;=\; A_2 \cdot v_2$ (Continuity Equation for Mass) $A_1 \;=\; \dfrac{ A_2 \cdot v_2 }{ v_1 }$ $v_1 \;=\; \dfrac{ A_2 \cdot v_2 }{ A_1 }$ $A_2 \;=\; \dfrac{ A_1 \cdot v_1 }{ v_2 }$ $v_2 \;=\; \dfrac{ A_1 \cdot v_1 }{ A_2 }$
Symbol	English	Metric
$A_1$ = Initial Area Cross-section	$in^2$	$mm^2$
$v_1$ = Initial Area Cross-section Velocity	$ft \;/\; sec$	$m \;/\; s$
$A_2$ = Final Area cross-section	$in^2$	$mm^2$
$v_2$ = Final Area Cross-section Velocity	$ft \;/\; sec$	$m \;/\; s$