A particle vapor reactor (PVR) includes a reactor body with a fluid flow conduit having an inlet end and an outlet end, the crossection of the conduit having a circular geometry at the inlet end, a rectangular geometry at its midsection, and a circular geometry at its outlet end. The PVR conduit defines a saturator section and a condenser section. A compact condensation particle counter (CPC) including the reactor is also disclosed. The CPC also includes a sample inlet, a fluid inlet section, a heater section, and a detector section.
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