There are currently no Fuel Cell vehicles being sold to the public. Only prototypes have been built.
You can use the hydrogen in fuel cells for power generation for a two wheeler motorcycle.
No, body cells cannot use hydrogen on its own as a fuel. It needs to be included in a carbohydrate such as sugar, protein or fats.
Hydrogen gas
There are a few different types of vehicles that use hydrogen fuel. You can find cars and other forms of transport that use hydrogen, but the biggest consumer would have to be hydrogen fueled space rockets.
Currently, there are no vehicles on the market which utilize the hydrogen fuel cell. Hyundai has plans to release a vehicle featuring hydrogen fuel cells as early as 2015. However, no vehicles currently exist that use this. There may be vehicles made by private individuals, but no pass produced vehicle has this technology right now.
Fuel Cell vehicles are available in limited quantities, e.g. http://world.honda.com/FuelCell/ , but the major challenges are that the cells themselves aren't really competitive with other fuel sources yet, and places to refuel the vehicles are scarce.
Water vapour.
water vapor
well being a scientist the procise answer is 34.7899999999999999% or we can shorten that by dividing it by the square root and then timsing it by 100 then divide the colijade and then folowed by a simple x fraction to equal, 12.5% if you were to calculate all the vechals it would be 45% because of the uses and adventages of hydrogen fuel cells.
There are already some fuel-cell cars out, they use a fuel cell. There have been prototypes of cars that run on water. Cars that run on hydrogen also. Electric cars definitely
All cars would use compressed air (or nitrogen) to inflate tyres. Most cars would use petrol or diesel as a fuel (in the US petrol is known as gas). Some cars use Propane gas as a fuel. Technology is being developed to fuel cars with Hydrogen gas.
They are too expensive and are hard to find.