How does a condenser work in a distillation apparatus?

In a distillation apparatus, a condenser functions as a heat exchanger designed to transform vapor back into a liquid state.12

The process operates by removing heat from the vapor as it passes through the device. Once sufficient heat is eliminated, the vapor undergoes condensation and liquefies. In laboratory settings, this is typically achieved by passing the vapor through a tube—often arranged in a coil or compact shape—that is cooled by an external medium, such as air or circulating water.13

By cooling the vapor, the condenser allows the purified substance to be collected as a liquid in a receiver. In more complex setups like fractional distillation, condensers also play a critical role in rectification by permitting some of the condensed vapor to return toward the still, which helps separate components with similar boiling points.3