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.
Sydney experienced its hottest summer since records began in the summer of 2016-17, with more than 10 days over 35 Â°C (95 Â°F). Sydney's 2017 mean temperature of 19.5 Â°C (67.1 Â°F) degrees was 1.7 Â°C (35.1 Â°F) degrees above the long term average and the second highest value in 158 years of records.