How do you soundproof a room? There are several ways, but the basic way of soundproofing a room is to make sure that there are no gaps in the walls or door and cover all surfaces in a material that absorbs sound. Sound is caused when energy is transmitted through something in a wave. When […]
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How do people breathe on a submarine? Submarines can carry a pressurized air supply, but most modern submarines make oxygen through a process called electrolysis. Producing enough oxygen for all of the people on a submarine isn’t the only thing to consider when trying to keep them alive. The air we breathe is 78 percent
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How does hydroelectric power work? Hydroelectric power works by converting the gravitational potential energy of stored water into kinetic energy, and then into electricity. As the first law of thermodynamics says, energy cannot be created or destroyed, only transformed from one type into another. This is what hydroelectric power does. A hydroelectric power station takes
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What makes a rainbow? A rainbow forms when light is refracted, reflected, and dispersed by raindrops in the air. The rainbow can only be seen from an angle of 42 degrees. The sun, or the source of light, must be behind you. We can see a rainbow because of the speed of light through an
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What is a filibuster? Filibuster has two meanings that are connected. The original, historical meaning of the word filibuster, is someone who “engages in an unauthorized military expedition into a foreign country or territory to foster or support a political revolution or secession”. The more modern meaning of the word filibuster is political, and it
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What is the Dewey Decimal system? It is a system used to classify books in libraries, so that they can be found easily. It was created by Melvil Dewey in 1876. Libraries have existed since writing was first invented. Whatever was written needed a place to be kept in. However, libraries were not public. Clay
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How does cling film stick? Cling film (also called plastic wrap, saran wrap, cling wrap, and food wrap) sticks to surfaces because of static electricity and because of the properties of the plastic it is made of. Cling film (Saran wrap) is another of those products that we can’t live without, but which were discovered
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Why are bubbles round? Bubbles are round because the liquid they are made of is naturally trying to make the smallest area it possibly can, and that is a sphere. A bubble is made when a liquid encloses a gas. If you are making soap bubbles, then that gas is the air. If you are
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How is nuclear fuel stored in glass? Spent nuclear fuel is not stored in glass. Spent nuclear fuel can be turned into glass through a process called vitrification. The word “vitrification” comes from the Latin “vitrum”, which means glass. We still use the word in some circumstances. The word “vitriol” comes from the same root.
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Who were Rolls and Royce? The Rolls and Royce of Rolls-Royce Limited were Charles Rolls and Henry Royce. Rolls-Royce is a hugely famous brand name, but it is actually not a single company these days. The company has two parts. The largest part is Rolls-Royce plc, which is the part of the company that makes
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