Several Companies had begun development of hydrogen cars but have dropped their programs because of cost. Currently Honda is producing hydrogen gas cars that are available for lease in California, well Hyundai and Lotus continue to develop potential hydrogen models.
BMW and Honda among others have built hydrogen cars. Mercedes developed the "gas tank" which is porous like a basalt stone or a hard sponge so that the gas only seeps out when stored under pressure. All auto companies have been encouraged to develop this technology because hydrogen gas is one of the first gasses to come out of a fresh oil well. The hydrogen is burned so the vehicle is not much different than one running off propane or natural gas.
CArs will not run efficiently on hydrogen gas
There are several companies that supply hydrogen gas for cars, including Air Liquide, Linde, and Air Products. These companies produce and distribute hydrogen for use in fuel cell vehicles as part of the growing infrastructure to support the adoption of hydrogen fuel cell technology.
No Hydrogen is a very flammable gas, there for it would react.
Car battery vapor is hydrogen gas and is extremely explosive.
Yes, they can but most cars don't.
No, you also need oxygen!
The term is HYBRID. It is a car that uses an alternate fuel for power. Such as electricity, hydrogen gas or a combination of power sources such as gas-electric.
fuel cell
fuel cell
fuel cell
Any lead-acid battery system when overcharged will produce hydrogen gas.