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A P1 licence may be issued after reaching age 17, logging 50 practice hours, holding an L2 licence for nine months, and passing a practical driving test. A P1 licence is issued for one year. P1 drivers must remain under 100 km/h, have a zero BAC while driving, and display P plates. Provisional drivers may tow other vehicles.
Even in oceans at 4 km depth, where the pressure is 400 atm, water suffers only a 1.8% decrease in volume. [ 100 ] The viscosity of water is about 10 −3 Pa· s or 0.01 poise at 20 °C (68 °F), and the speed of sound in liquid water ranges between 1,400 and 1,540 metres per second (4,600 and 5,100 ft/s) depending on temperature.