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2. Mach number - Wikipedia

   en.wikipedia.org/wiki/Mach_number

   By definition, at Mach 1, the local flow velocity u is equal to the speed of sound. At Mach 0.65, u is 65% of the speed of sound (subsonic), and, at Mach 1.35, u is 35% faster than the speed of sound (supersonic). An F/A-18 Hornet creating a vapor cone at transonic speed just before reaching the speed of sound.

3. Ton-force - Wikipedia

   en.wikipedia.org/wiki/Ton-force

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4. Energy efficiency in transport - Wikipedia

   en.wikipedia.org/wiki/Energy_efficiency_in_transport

   The environmental calculator of the French environment and energy agency (ADEME) published in 2007 using data from 2005 [144] enables one to compare the different means of transport as regards the CO 2 emissions (in terms of carbon dioxide equivalent) as well as the consumption of primary energy.