No, a conventional car cannot run on water as a direct fuel source. Water lacks combustible properties because it is chemically stable (H₂O) and cannot undergo oxidation like gasoline or diesel in an internal combustion engine. Instead, water can cause severe engine damage, such as hydrostatic lock, if introduced into the fuel system. However, advanced technologies like hydrogen fuel cells utilize water indirectly—hydrogen derived from water via electrolysis powers the vehicle, with water as a byproduct. This process is energy-intensive and not equivalent to using water as fuel.
The fundamental issue is energy density. Gasoline provides about 34 megajoules per liter (MJ/L) of energy through combustion, while water offers zero combustible energy. For authority, the U.S. Department of Energy confirms that water cannot serve as a vehicle fuel due to its inert nature. Some systems use water injection to reduce engine temperatures or emissions, but this is supplemental.
| Fuel Type | Energy Density (MJ/L) | Combustible | Common Use in Vehicles |
|---|
| Gasoline | 34 | Yes | Primary fuel for most cars |
| Diesel | 38 | Yes | Higher efficiency engines |
| Hydrogen | 5-10 (compressed) | Yes | Fuel cells, requires production |
| Water | 0 | No | Not a fuel; can cause damage |
| Ethanol | 24 | Yes | Biofuel alternative |
This table highlights why water is impractical. For credibility, always consult reliable sources and avoid exaggerated claims about "water-powered" cars. Instead, consider proven alternatives like electric vehicles or hybrids for eco-friendly transportation.
