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...e either fixed or variable in size. The choke is nothing more than a small orifice, usually from 1/8 to 3/4 in. in diameter, that restricts the flow rate. [[file:surface-production-equipment_fig6.png|thumb|300px|{{figure number|6}}Orifice meter for gas measurement.]]

Pore throats act as molecular sieves, allowing particles smaller than the orifice to pass and retaining larger particles. If seals were uniformly composed of