Physics Topics
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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