why is liquefied nitrogen used as a rocket fuel though nitrogen does not suppert vombustion
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Liquid nitrogen was experimented with way back in the 1900's to power cars, and it does work. But it is not an energy source, just a way of storing energy. Just like a battery. You must get energy from somewhere (fossil fuels, hydroelectricity or whatever) to pressurise air to create liquid nitrogen, then you release that energy to run a car. The same goes for hydrogen powered cars - it works, but it's really just a different sort of battery, not an energy source, because you need energy to produce the hydrogen.
In other words, it cannot replace fossil fuels unless you come up with some other way of generating vast quantities of energy to produce vast quantities of liquid nitrogen. Nor can hydrogen. Personally I think we should be focussing on pure electric vehicles and improved battery technologies, as good efficiencies are possible there - but again we need to generate the electricity somewhere.
7 Recommendations
7 years ago

Michael Whitworth
1.51University of Bolton
Liquid Nitrogen is frozen and compressed nitrogen ; which makes it go further but requires large strong fuel tanks to contain the extremely cold pressurized liquid.
The freezing and compression process uses a lot of energy in the process so as long as the energy/electricity generated is generated by green energy such as solar, wind, or hydro power - it remains a good source of fuel and should be cheaper than petrol or diesel.
Liquid nitrogen goes through a heat exchanger where it expands from the cold liquid presurised state to expanded nitrogen gas, this is similar to how a steam engine works and has enough force to power a turbine or to pump the pistons of a car engine.
Water could be used by heating the water up to create steam but the co2, nox, and co created by burning fossil fuels would be harmful to the environment and to peoples health - and as we know they are running out so liquid nitrogen could soon be an Alternative Fuel on the roads.
I did my University Dissertation about alternative fuels and Hydrogen triple hybrid engines will probably be the best - they use liquid hydrogen, also petrol or diesel, and a large lithium battery. The battery drives the car up to about 30mph and the fuel takes over for faster speeds, the car also charges the battery whilst it is running at higher speeds and using fuel - these cars will be very economical and you do not have to always to up with petrol or diesel you can save money and the environment by using hydrogen.
Hydrogen is the most abundant element in the universe and powers most stars and makes up water, it is highly flammable and is almost as efficient as petrol and diesel. Hydrogen is the best choice for an alternative fuel.
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All Answers
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7 years ago

Sriraam R Chandrasekaran
25.06University of Illinois, Urbana-Champaign
Liquid Nitrogen is a pressurized form. When you expose it to ambient atmosphere the pressurized Nitrogen gets released that can be used to rotate the piston. While water can not exert that much pressure at ambient atmosphere.
1
In other words, it cannot replace fossil fuels unless you come up with some other way of generating vast quantities of energy to produce vast quantities of liquid nitrogen. Nor can hydrogen. Personally I think we should be focussing on pure electric vehicles and improved battery technologies, as good efficiencies are possible there - but again we need to generate the electricity somewhere.
7 Recommendations
7 years ago

Michael Whitworth
1.51University of Bolton
Liquid Nitrogen is frozen and compressed nitrogen ; which makes it go further but requires large strong fuel tanks to contain the extremely cold pressurized liquid.
The freezing and compression process uses a lot of energy in the process so as long as the energy/electricity generated is generated by green energy such as solar, wind, or hydro power - it remains a good source of fuel and should be cheaper than petrol or diesel.
Liquid nitrogen goes through a heat exchanger where it expands from the cold liquid presurised state to expanded nitrogen gas, this is similar to how a steam engine works and has enough force to power a turbine or to pump the pistons of a car engine.
Water could be used by heating the water up to create steam but the co2, nox, and co created by burning fossil fuels would be harmful to the environment and to peoples health - and as we know they are running out so liquid nitrogen could soon be an Alternative Fuel on the roads.
I did my University Dissertation about alternative fuels and Hydrogen triple hybrid engines will probably be the best - they use liquid hydrogen, also petrol or diesel, and a large lithium battery. The battery drives the car up to about 30mph and the fuel takes over for faster speeds, the car also charges the battery whilst it is running at higher speeds and using fuel - these cars will be very economical and you do not have to always to up with petrol or diesel you can save money and the environment by using hydrogen.
Hydrogen is the most abundant element in the universe and powers most stars and makes up water, it is highly flammable and is almost as efficient as petrol and diesel. Hydrogen is the best choice for an alternative fuel.
5 Recommendations
All Answers
40
7 years ago

Sriraam R Chandrasekaran
25.06University of Illinois, Urbana-Champaign
Liquid Nitrogen is a pressurized form. When you expose it to ambient atmosphere the pressurized Nitrogen gets released that can be used to rotate the piston. While water can not exert that much pressure at ambient atmosphere.
1
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