Did you know that a power station can produce electricity without burning coal or oil, and without using nuclear fuel? How? A power station can turn the potential energy of water into kinetic energy and then convert this energy into…
What is Nuclear energy Nuclear energy is the most powerful form of energy in the universe. What is nuclear fission and nuclear fusion There are two ways of producing it and both ways release enormous amounts of energy. One way…
How do we get energy from food? We use energy all the time, even when we are asleep. We need energy for our body to work. We need energy to keep us warm. When the weather is cold, or when…
How can you tell a fresh egg from a rotten one? It’s easy. Put them in a bowl of water. The fresh egg will sink but the rotten one will float. Fresh eggs sink because they are more dense…
Pour a teaspoonful of salt into a glass of water.Now stir it and watch the salt slowly disappear from sight.It is dissolving in the water.How do you know the salt is still there? Try tasting a drop of the water.Gases also…
When you pump up your bicycle tires or football, you are making use of compressed air. Inside a bicycle pump is a small device called a valve. A valve allows a gas or a liquid to pass through it in…
Look out of your window. Is the air moving? It is probably moving enough to make the branches on the trees sway slightly. The weight of this air pressing down all around the earth produces air pressure. If you live…
At the refinery, thousands of tons of oil are turned into useful substances every day. What is Crude Oil? Crude oil is a mixture of many different chemicals called hydrocarbons. Hydrocarbons are useful because they can be used to make…
What is Electroplating? If you pass electricity through a solution, you can cause a chemical reaction. New substances are produced where the electric current enters and leaves the solution—at the electrodes. Electricity can also change the electrodes themselves. Here is…
Have you ever hunted for buried treasure? You could just start digging anywhere and hope that you would find something. Or you could use a metal detector.