bernoulli's principle says.. total pressure = static pressure + dynamic pressure + pressure from height, right? but how come I hear that an increase in velocity is a decrease in pressure? if you increase velocity as the 'v' part in dynamic pressure won't the entire pressure increase as well? because it just adds to the rest. Same thing with height pressure. if height is higher, won't the total pressure be more because you mutiply height to gravity and density, then you add to other pressures. I read as an example on a site... that when you turn on the shower in the bath tub the curtains get pulled inward beacuse of a decrease in pressure ( . ) Well if it starts raining outside then, does this mean atmospheric pressure is no longer 14.7psi, but less? this is confusing. plz clarify, thanks.