# Formula Continuity equation for fluid flows 1st cross-sectional area    1st flow velocity

## 1st cross-sectional area

Unit
Cross-sectional area for example of a pipe at a certain point. With a large cross-section, the flow velocity $$v_1$$ of the fluid is small.

## 1st flow velocity

Unit
Velocity with which the fluid flows through the cross-sectional area $$A_1$$.

## 2nd cross-sectional area

Unit
Cross-sectional area for example of a pipe at a different location. The pipe could have different cross sections at two different locations. For example, the smaller cross-section (pipe narrowing) may have cross-sectional area $$A_2$$.

## 2nd flow velocity

Unit
Velocity with which the fluid flows through the cross-sectional area $$A_2$$.