Generally the liquid is water and the fluid above the liquid is air. The molecules within the liquid attract each other and at the interface there are more attractive forces towards the bulk of the liquid than there are towards the adjacent gas molecules. The molecular forces tend to pull into the fluid bulk.
Weather lowdown. Despite the fact that the month of September in Athens can produce summer-like temperatures, the weather starts to cool off significantly in October, and especially at night. The average temperature this month is 19Â°C (66Â°F), while the average low is 15Â°C (59Â°C), and the average high is 23Â°C (73Â°F).
The daily average sunshine this month is just three hours, which is tied with November and December for the least amount of sun in Athens of any month. Coinciding with the small amount of sun is a fairly high chance of rain for Athensâ standards. The average rainfall in January is 40mm occurring over nine days.