It's very simple to prove whether or not "exhaust density" powers a turbocharger. Just plug your exhaust pipe and see how much boost you get. After all, back pressure increases the density of the exhaust gasses.
The correct answer, which isn't on your list, is "exhaust energy". Specifically, it's the enthalpy of the exhaust gas leaving the turbo subtracted from the enthalpy of the exhaust gas entering the turbo. Combustion of unburned fuel COULD contribute to the exhaust energy, but 1) modern gas and diesel engines don't have a lot of unburned fuel leaving the combustion chamber, and 2) the fuel would have to burn prior to entering the turbo in order to contribute to the exhaust enthalpy.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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