What is the ability of water to condense on the surface on a cool glass mainly due to?

Because of its contact with air surface

Explanation:

When the water comes into contact with surface of a cool glass, water surface gets its contact with open surface air.

Due to the contact of water droplets with atmospheric air water particles condense up, which means molecules inside the water droplets comes into close contact where the inter molecular spaces becomes tight than previous.

Hence, Water gets condensed while it is brought into contact with cool glass.