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If you mean the volume, that's a scalar. If you mean the mass, that's a scalar as well.
Water pressure refers to the pressure of water in a system. In a home it will be 30-50 psi typically and this is governed by the municipal pressure or by a well tank.
If you have a septic system, you are generally outside the city limits. So your water is probably not city water, it's well water from your own or a shared well.
the pressure under ground forces the water up to the surface
If you are on a well.
No, you still get fresh water and dispose of the dirty. A closed system filters and reuses the same water.
In a well system, water is propelled by air pressure.
well im guessing no water?
There should be a configuring switch on your water system, i.e water tank or well.
Introduces air into the system at an atmospheric pressure
In the U.S.A. most people are either on a municipal water system or they have a well.
"Pozo" is a Spanish word that means "well" in English. It is commonly used to refer to a hole or shaft dug into the ground to reach water or minerals.