My barometer measures atmospheric pressure in inches or millimetres.
This is actually a unit of length, not pressure.
But it has been common practice to refer to pressure in this way since before electric circuits were invented and is still in common use today.
This usage of 'static head' to represent pressure gave rise to the original hydraulic analogy for electric circuits. In these terms the analogy is pretty exact. Unfortunately many modern authors have changed this analogy to pressure flow in pipes, which is a poor analogy, especially when using the force/area definition of pressure.
As it is a deal of work to prepare a description of the static head analogy I will proceed if there is enough demand for a sensible discussion.
This is actually a unit of length, not pressure.
But it has been common practice to refer to pressure in this way since before electric circuits were invented and is still in common use today.
This usage of 'static head' to represent pressure gave rise to the original hydraulic analogy for electric circuits. In these terms the analogy is pretty exact. Unfortunately many modern authors have changed this analogy to pressure flow in pipes, which is a poor analogy, especially when using the force/area definition of pressure.
As it is a deal of work to prepare a description of the static head analogy I will proceed if there is enough demand for a sensible discussion.