Enter the boundary layer air density and the boundary layer vertical outflow into the Calculator. The calculator will evaluate the Pressure Tendency.

## Pressure Tendency Formula

PT = -g*pbl*Wbl

Variables:

- PT is the Pressure Tendency ()
- pbl is the boundary layer air density
- Wbl is the boundary layer vertical outflow

To calculate Pressure Tendency, multiply the boundary layer air density by the boundary layer vertical outflow, then multiply by -9.8m/s^2.

## How to Calculate Pressure Tendency?

The following steps outline how to calculate the Pressure Tendency.

- First, determine the boundary layer air density.
- Next, determine the boundary layer vertical outflow.
- Next, gather the formula from above = PT = -g*pbl*Wbl.
- Finally, calculate the Pressure Tendency.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

boundary layer air density = 6.54

boundary layer vertical outflow = 1.234