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The 21st century is a revolutionary era. New technologies are planned almost every day. But I think the most beneficial technology invented in the 21st century is the fuel cell.

What is a fuel cell? "A fuel cell is a device for electrochemical energy conversion. A fuel cell converts the chemicals hydrogen and oxygen into water, and in the process, it also produces electricity. "In short, the fuel cell has a function similar to a rechargeable battery .

One of the biggest advantages of using fuel cells is reduction of pollution. Because the fuel cell uses hydrogen and oxygen reduction of pollution, will no longer be a dream. The use of gasoline in cars produced a large amount of pollution. However, the fuel cell using, cars emit more pollution.

Another advantage of using fuel cells is Power Efficiency. "A car gasoline is inefficient. The heat coming out the exhaust is a waste of energy. The overall efficiency of a gas engine of the car is about 20 percent. On the other hand, Battery-powered car is very effective as the overall efficiency is about 72 percent. In comparison with plants today, fuel cells are great to produce electricity more efficiently. "

The third advantage of fuel cells is the longevity of the battery. Laptops, cell phones and hearing aids can be powered by fuel cells and they can last longer than the usual battery. Moreover, the fuel cell can be quickly recharged with a liquid or gaseous fuel.

The advantages of fuel cells are not just limited to reducing pollution, energy efficiency and greater autonomy. It can also be used to feed other applications such as lamps, heaters, etc. The only problem with the fuel cell is how the hydrogen is not available and it is difficult to store and distribute decisions of soaring costs.

Fuel cells are clean and efficient, it is also in all sizes. I think the fuel cell is the door that will lead the world toward a bright new era. Who claim they want a better source of energy that lasts longer and is not dangerous for the environment?

The use of fossil fuels is dangerous for the environment and increases global alert, because it introduces greenhouse pollution, so fuel cells is really the best invention of the 21st century because it fuels growth fossil, which is limited. Without fossil fuels, we would be unable to travel to places abroad with aircraft or submarines. Without fossil fuels, it would be more cars or motorcycles to help us travel to places faster. When fossil fuels are exhausted, so instead of improving at a better time, we would be backwards. Machines will be replaced by the new man, and almost all the technological decline.

The invention of the fuel cell can solve this fatal problem and save mankind backwards. So I think that fuel cell is the greatest invention of the 21st century.