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Why do we use 360 degrees for a complete circle?

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Sumerians, Greeks and Babylonians were the forerunners in observing the astronomical objects, may be for omens initially and later for calc...

Vectors

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What is a vector? In everyday life, we measure things. For example, what is the size of something, what is the volume (how many liters) o...

Symmetry and Emmy Noether's theorem

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Emmy Noether's theorems provide profound relation between a system having symmetry and constancy of a physical quantity. That is, there...

An easy way to find Latex code

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There exists an excellent site on which you can find out the key for most of the $LaTeX$ comments. The site is Detexify Latex handwriting...

Conservation of angular momentum

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It is interesting to see the demo for "Conservation of angular momentum". The MIT2K series has an excellent video on the conserva...

Notes on Fermi-Dirac distribution

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As per my knowledge, in our universe, number of Fermions are more than Bosons (correct me if I am wrong). Apart from this, my interest to w...

Notes on Dark matter and Dark energy

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Dark matter and dark energy are one of the intriguing problems which keep awake theoretical physicists. See this picture for a schematic...

Heizenberg's Uncertainty Principle

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 Nobel laureate Weinberg ( Ref. 7 of the English translation of the original paper by Heisenberg's paper)  has written as follows : ‘I...

Topology

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Wikipedia article on  topology   says: "Topology is concerned with the properties of space that are preserved under continuous defor...

The pair of words that always confuse for many people

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There are some words and phrases which is always confusing to us (or at least for me 😊). Here is some of the list. It may take a while t...