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).
Prices are low, nothing is crowded and the weather is pleasant. Plenty of events and festivals to enjoy the best fall in Greece. The weather is pleasant but can get cooler by the end of the month. The trend, however, is to have quite warm weather in October so donât worry about the weather being too cold. Itâs worth it to check the forecast bit in advance though.