Question

Pressure is measured using the SI unit Pascal (Pa). What is the derived SI unit for pressure?

Answer 1

`Pa=N//m^2=N*m^(-2)` or Newton per square meter

Explanation:

The Newton can be further broken down into basic units:
`N=kg*m//s^2`, meaning that a force of `1N` will give a mass of `1kg` an acceleration of `1m//s^2`

So in basic units pressure can be summarized as:

`N/m^2=(kg*cancelm//s^2)/m^cancel2=(kg)/(m*s^2)`, but this is hardly done.

Since the Pascal is a very small unit, the kiloPascal (`kPa=1000Pa`) is often used. Also in use is the unit hectoPascal (`hPa=100Pa`), as it has the same size as the milliBar (`mBar`), that is still widely used for (atmospheric) pressure, as `1Bar(1000mBar)` is close to `1atm`, an older unit for pressure.