Example image of eyePlorer eyePlorer map for 'Compressed-air vehicle': Compressed air Compressed-air engine Expansion Piston Battery electric vehicle Regenerative brake Compressed natural gas Pressure vessel Cubic foot Pounds per square inch Compressor Electrical grid Parking lot Energy density Locomotive Mining Torpedo Jules Verne Paris in the Twentieth Century Gotthard Rail Tunnel Gotthardbahn Compressed air car Electric vehicle Cooling Muffler Torque Charles's law Intercooler Fuel cell vehicle Lithium-ion battery Thermodynamic process Prototype Bus MDI Truck Régie Autonome des Transports Parisiens Fireless locomotive Airbus SAE International Charging station Pneumatics OScar (open source car) CAV Citroën AX Hybrid vehicle Energy development