How do fluorescent lights work? They pass an electric current through a low-pressure mercury-vapor, which produces light. A fluorescent light is made of a tube of glass that has a tungsten electrode at each end. Inside the tube is a tiny amount of mercury and an inert gas. There is a phosphor powder coated along […]
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How does a nuclear bomb work? By splitting the nucleus of an atom and releasing the energy. There are two ways to make energy from an atom: fusion and fission. Fusion is the process that happens in our sun. The sun fuses four hydrogen atoms together to make one helium atom. One helium atom has
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Why do soldiers break stride on a bridge? So that the vibrations don’t make the bridge collapse. This rule was introduced by the British Army in 1831. On 12th April 1831, the 60th Rifle Corps were returning from a military exercise and they crossed over the Broughton Suspension Bridge, which had been built five years
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What are the four fundamental forces? The strong force, the weak force, gravity, and the electromagnetic force. The four forces are the fundamental forces that govern everything in the universe. They are fundamental because they cannot be broken down into simpler parts and they are the reason behind all of the laws of physics. Gravity
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Why do some things bounce and other things don’t? Things that bounce have more elasticity than things that don’t bounce. For something to bounce, it has to has to have kinetic energy. It then has to transfer this kinetic energy to internal energy and then back to kinetic energy without losing any energy in the
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How can planes fly upside down? Because of the shape of their wings and the angle that they fly at. Planes fly because of lift. Air is not an empty substance. It has molecules in the same way as a table or a chair. The air is made up of nitrogen, oxygen, carbon dioxide, neon,
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How does aspirin work? Aspirin works by stopping an enzyme called cyclooxygenase. When our tissue or organs are damaged or infected, they produce prostaglandins. These are fatty acids that act like hormones. Prostaglandins do many different jobs in the body. They are similar to hormones but they are not hormones. Hormones are produced in glands,
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How many dimensions are there? There are either 4, 10, 11, or infinite dimensions, depending on what theory you read. What is a dimension? A dimension is the minimum number of coordinates needed to specify a point within that dimension. We can experience four dimensions. The first dimension is length. A straight line exists in
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How did Galileo realize that the Earth orbits the sun? He realized it when he observed the orbit of Venus. Galileo was born in 1564 in Pisa, Italy. Galileo is famous for saying that the Earth orbits the sun rather than the sun orbits the Earth, but he was not the first person to come
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Why doesn’t silicone melt in the oven? Because it doesn’t have a specific melting point. Most of us will not put rubber or plastic dishes in our oven because they will obviously melt. Natural rubber has a melting point of 180°C. The melting point of plastic depends on the type of plastic. PET (polyethylene terephthalate)
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