Physics Topics
How Many Chemical Elements are There? A chemical element is a type of atom, like hydrogen or oxygen. As of January 2007, 117 elements have been observed, with 94 of these elements occurring naturally on Earth. 23 elements are artificially created, in nuclear reactors or particle accelerator experiments. The first synthetic element to be created [...]
How Much Uranium is in the Solar System ? We don’t know the composition of the asteroids or the objects in the Oort comet cloud or the Kuiper belt in great detail. One theory of solar system formation is that there are more metals in the inner solar system. That would mean most of the uranium is Mars, [...]
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How many molecules of water are in a single drop? The simplest way is to know two things about the object: 1) Its chemical composition. 2) Its mass. As an example, let’s say we have a very tiny drop of water, say 1 microliter, which would have a mass of 0.001 grams. The chemical formula [...]
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How much does planet Earth weigh? It would be more proper to ask, “What is the mass of planet Earth?”1 The quick answer to that is: approximately 6,000,000,000,000 ,000,000,000,000 (6E+24) kilograms. The interesting sub-question is, “How did anyone figure that out?” It’s not like the planet steps onto the scale each morning before it takes [...]
How many kilometers are in the speed of light? The speed of light (usually denoted c) is a physical constant. Its value is exactly 299,792,458 metres per second, often approximated as 300,000 kilometres per second or 186,000 miles per second. It is the speed of electromagnetic radiation (such as radio waves, visible light, or gamma [...]
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How Many Atoms Are There in The Known Universe? Just to give you some perspective on how many atoms it might be, the number of atoms alone in the graphite in your pencil is about 25000000000000000000000 atoms. But, we should probably give you a number to use, just in case you are interested. This won’t [...]
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