Nitrogen Engine: End of the electric car?
Liquid nitrogen does an even better job. Being considerably denser than liquid air, it can store more energy per unit volume, allowing cars to travel further on a tankful of the stuff. Weight for weight, liquid nitrogen packs much the same energy as the lithium-ion batteries used in laptops, mobile phones and electric cars. The big difference is that a liquid-nitrogen car is likely to be considerably cheaper to build than an electric vehicle.