Many times this question comes to mind why our vehicles cannot run with water. Why petrol and diesel are needed to run them. Surely, if a vehicle runs with energy, then it cannot get energy from water.

Petrol and diesel are both petroleum products, they are also called fossil fuels. Petroleum fuels are made of hydrocarbons. Hydrocarbon molecules consist mostly of carbon and hydrogen atoms. 

Also, some other elements like oxygen are also present in them. Not only petrol and diesel but also wood, coal, paper etc. contain hydrocarbons. They are burned and converted into energy. 

So how is energy produced? 

When you burn hydrocarbons in the air, its molecules break down. They then combine with oxygen to form carbon dioxide (CO2) gas and water (H2O). In this process, the energy released by the breaking and joining of molecules is released in the form of heat. This is called combustion. It generates a lot of energy. 

When did humans first know the form of energy 

Energy has been produced by the use of hydrocarbons for thousands of millions of years. It was born for the first time when humans learned to use fire. In order to drive vehicles, it is necessary to generate this energy not in the form of heat, but in such a way that the devices can be run. In cars, the burning process of petrol or diesel is done in a closed canister. These engines do their work in such a way that they use maximum energy. 

Why water cannot be burnt like fuel 

At the same time, water cannot be burnt like fuel. Actually, there is no chemical process of water, with the help of which water can be used as fuel. However, when water is converted into hot steam, it definitely produces energy, but for this energy, coal or other fuel is also needed to heat water, so this process is not useful in small vehicles and cars. 

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Then how did steam engines run 

It is true that the steam engine used to run through the power of steam, but steam had to be continuously poured into it. For this reason, this technique was replaced by electric or diesel engines. 

When does energy arise from water?

Talking about chemical activities, there is no way to extract chemical energy from water alone. When the water is drained with great force, it definitely produces energy, which is used in hydroelectric plants or dams. In large dams, water is spilled on the turbine from a considerable height. Turning turbines generate electricity. But where to bring such height in the car, it will be difficult to do so. 

Suppose you want to build a water-powered vehicle, then first you will need a device that can break water molecules and separate oxygen and hydrogen. Both the gas will have to be kept in separate tanks.

After this, they will need a combustion system, which can burn both. But this process will not be very effective, but if there is a slight collision of two vehicles due to hydrogen, then a big explosion can happen.