Laboratory condensers with passive heat exchange

An air-cooled laboratory gas condenser for condensing gasses and vapours, comprising:

• an inner tube having an elongate length and a bore extending therethrough between a first end region and a second end region of the inner tube, the inner tube being made from glass;
• an outer tube having a bore therethrough and two ends, the inner tube passing through the bore of the outer tube, the outer tube being made from a metal material;
• and
• a respective seal at each end of the outer tube, sealing the outer tube to the inner tube at the first and second end regions so as to define an annular elongate sealed space between the inner tube and the outer tube extending along the elongate length of the inner tube between the seals, wherein:
• the sealed space is at least partly filled with a heat-conductive liquid such that the liquid is in contact with both the inner tube and the outer tube,
• the outer tube comprises a plurality of internal fins extending into the sealed space between the inner tube and the outer tube and a plurality of external fins extending outwardly from an outer surface of the outer tube,
• each of the seals comprise a first part, the first part having an external threaded portion that engages a corresponding internal thread formed in the bore of the outer tube at a respective one of the ends of the outer tube so as to fix the first portion relative to the outer tube,
• each of the seals further comprise a second part, the second part having an internal threaded portion that engages with a corresponding external thread of the first part so as to fix the first and second parts together,
• the first and second parts of the seals each have respective through-holes through which the inner tube passes, and
• the inner tube is provided with a key for inter-engaging with only one of the seals, the first and second parts of the seal for which the key is provided being arranged to fit either side of the key.