Question

explain how the steam changes back into a liquid in the condenser​

Answer 1

When the water in the flask boils, it produces steam, which has gas molecules inside the flask that move very quickly, pushing out the air. ... When the flask cools the gas molecules on the inside begin to move much more slowly and create less collisions and thus less pressure.

Answer 2

When the water was heated, its molecules began to move rapidly, turning some into its gas phase: steam. ... Without heat, the water molecules inside the bottle start condensing—that is, they start turning from steam back into liquid water