1. Pressure is defined as force per unit area that a fluid exerts on its surroundings.[1] For example, pressure, P, is a function of force, F, and area, A. P = F/A. A container full of gas contains innumerable atoms and molecules that are constantly bouncing of its walls.
Length of the day in Sydney is 10:03 hours. Civil twilight begins at 06:32:04 and ends at 17:29:15 hours. Nautical twilight in Sydney begins at 06:01:11 and ends at 18:00:08 hours. Astronomical twilight in Sydney begins at 05:30:58 and ends at 18:30:20 hours.
This is a great time to enjoy Sydneyâs abundant beaches when water temperatures rise to 21.9 - 23.7Â°C (71.4 - 74.7Â°F). Autumn is the mildest time of year in Sydney when the humidity drops and average temperatures fall between 14.6 - 22.2Â°C (58.3 - 72Â°F). Crisp, fresh air makes autumn the season for enjoying Sydneyâs coastal walks.