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# List of Phase Builds and Guides - Page 4

Great thread, I'm learning quite a bit thanks to it.

One question though.. On the Basic Refrigeration Theory (first link), it says

"You can imagine the large pressure drop when the liquid from a 1/4" or 3/8" or larger pipe is forced to go through such a small opening." when explaining the metering device.

I thought forcing a large amount of liquid through a small opening would increase pressure? (like when you put your thumb over the nozzle of a hose, the pressure increases under your thumb).

Sorry in advance if this is a dumb question, maybe I'm misunderstanding something.
Excuse the long lack of an answer!

This is because you are thinking about the wrong portion of the liquid! When you place your thumb over the nozzle of a hose, the pressure under your thumb is very large, but the pressure after the thumb, the pressure around the spray of water, is very low.

As water is incompressible, this is not a very good example, but we can think about the simple relationship between pressure and velocity-- pressure can be thought of as potential energy, an velocity as, kinetic energy. As is the case of dropping a ball from some height, the potential energy (gravitational in this case) is changed into kinetic energy (velocity). By increasing the velocity, we decrease the pressure.

Please PM me and do not let questions sit! I will try and be more active as I get back into the scene!
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