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What is the key difference between SI and MKS units?

The history section of the SI page on Wikipedia covers the history quite well. Basically, MKS came before SI. It was later upgraded to include electromagnetic units, creating a new system called ...
Cort Ammon's user avatar
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What is the key difference between SI and MKS units?

The main difference is the standards. MKS is/was based on the traditional standards, e.g. a kg was the mass of one liter of water at a specified temperature, a meter was 1/10,000 the equator-to-pole ...
JEB's user avatar
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Relationship between bel and decibel

This is similar to the accepted answer. Suppose we have power $P$ and $P_0$. We express the power $P$ in B (Bel) relative to $P_0$ as \begin{align} L =& \log_{10}(P/P_0)\text{ B}\\ =& \log_{...
Jagerber48's user avatar
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Relationship between bel and decibel

I was asking myself the same question as this guy If a 10th of a bel is a decibel, why are we multiplying by 10, shouldn't we be dividing by 10? Answer, we don't want one 10th, we want the number of ...
Cot Sabaca's user avatar
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Fundamental and derived physical quantities

A base unit of measurement, or fundamental unit, is adopted for a base quantity within a conventionally chosen subset of physical quantities, such as the SI base units: meter, kilogram, second, ampere,...
cconsta1's user avatar
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