Ever heard of oxygen?
Fuel is mixed with air, compressed then ignited.
It's a mixture of fuel and air. It can't be done without oxygen - that's one of the elements needed for fire,
The Bio-fuel is burnt in air to heat water.
Yes. It's a fossil fuel, burnt and released into the air w/o any cleaning.
The intake manifold routes the fuel/air mixture to the cylinders or just the air on a modern fuel injected engine. The exhaust manifold routes the burnt fuel gases out of the engine into the exhaust system.
Air is fed into the cylinder - to mix with fuel. The fuel cannot burn without air !
An example of a motor that burns fuel without air is a solid fuel rocket motor. These motors contain both fuel and oxidizer within the fuel itself, allowing combustion to occur without the need for external air.
When fuel is burnt, the chemical reaction typically involves the combustion of hydrocarbons (such as octane in gasoline or methane in natural gas) with oxygen from the air to produce carbon dioxide (CO2) and water (H2O) as the main products.
Compression ignition engines can easier be made to run lean, meaning they'll havemore air than what's actually needed for the amount of fuel that's present. With excess air,(and higher temperature) it's easier to get more of the fuel burnt. With more of the fuel burnt, there's less unburnt fuel being vented as exhaust, meaning fewer emissions.
Carbon dioxide is produced when carbon is burnt in air.
It is burnt.
When it is burnt it combines with oxygen from the air and ends up mostly as water vapor (H2O) and carbon dioxide (CO2). The additional weight comes from the oxygen that was in the air. So really there's only a net gain of the weight of gasses in the atmosphere of 6.8 pounds.