weight is a function of density, volume does not matter when
pressure is measured in PSI.

The density of gasoline changes much? Weight is mainly a function of
the quantity of matter present (mass) and the gravitational field it's
in. Given liquid gasoline and the earth, volume is a good stand-in for
weight.

Pressure depends on the height of a column of fluid in a gravitational
field. Is that what you meant?

Jose
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