It's simply a fact of physics that each fission of a U-235 nucleus releases a certain amount of energy. Taking weight for weight, this is much more energy than a similar weight of any fossil fuel releases on burning.
We don't need nuclear reactors, but they are attractive for energy production in a number of ways. First of all, they are relativley low maintenance compared to coal plants (which make up most of the energy production in the U.S.). Secondly, they can produce an enormous amount of power with very little fuel. Thirdly, it does not pollute the enviornment, and last but not least, they are usually very reliable and safe.
Nuclear energy is a type of energy that needs very little mass. Nuclear energy is used to generate electricity and heat.
To make energy in Little Alchemy, combine fire and air to create energy. Alternatively, you can combine fire and wind to create energy.
The use of nuclear energy in civilian society is to generate electricity. In the military it is to make bombs (and hopefully not use them). There are also some uses in medicine where radio isotopes can be used for diagnosis and treatment. These isotopes are produced by irradiation in low power reactors which enable short lived radio isotopes to be obtained as required.
Sea water is used to cool nuclear reactors in emergency situations when fresh water is not available. We usually find very pure water used in nuclear reactors as a primary coolant. This water stays quite pure and retains little radiation after shutdown and cooldown. But if an emergency situation arises and the "regular" primary coolant (the fresh water) is lost, it must be replaced with any water to cool the reactor. Sea water is better than nothing.
The reason nuclear energy is most efficient today is, because with little it can create a hundred times more. For instance, Japan's entire economy is constructed on nuclear energy. Even if they have suffered, because of some inconveniences, before that they use to be the leading economical giant. In general nuclear energy is the most efficient resource on the planet, right now.
Photon
No, nuclear energy produces very little carbon dioxide during operation, while burning coal emits significant amounts of carbon dioxide. Nuclear energy is considered a low-carbon energy source.
E = Mc2 has little to do with the design of nuclear weapons, it is just a simple unitts conversion equation between energy and mass, just like feet = miles 5280 is a simple units conversion equation between feet and miles.They are more interested in the fissioning mass and efficiency figures in the design of nuclear weapons. For example in Little Boy about 787 grams of the uranium used fissioned giving an efficiency of about 1%. The actual mass conversion to energyas shown by E = Mc2 is roughly 450e-15 grams converted to energy to give the roughly 15 kiloton yield of Little Boy. This is because c2 is such a large conversion factor!
Coal energy releases greenhouse gases when burnt, causing global warming. Nuclear power has very little effect on climate change.
Energy: Fire + Air = Energy Fire = Starter Air = Starter
Nuclear power helps by providing a reliable source of low carbon energy that can help reduce greenhouse gas emissions and combat climate change. It also contributes to energy security by providing a stable source of electricity that is not dependent on weather conditions like solar or wind power. Additionally, nuclear power can help diversify the energy mix and reduce reliance on fossil fuels.