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# Questions tagged [si-units]

A set of internationally accepted units to aid in communication of measurements.

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### Physical quantity that can be expressed using multiple fundamental units [closed]

Any physical quantity can be represented as a product of powers of fundamental SI units.For example, Force has dimensions $[\text{kg}\ \text{m}\ \text{s}^{-2}]$ and has three fundamental units. ...
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### Why are electrical units (specifically, electrical current) considered a base unit?

Note: this is NOT a question why current is the base unit as opposed to charge—that’s because measuring $1 \ \mathrm{ A }$ through a wire is easier to measure in a lab than is $1 \ \mathrm{ C }$ in ...
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In the TOV equation of state of neutron star if we take central pressure and central energy density in Mev/fm^3, then in what will be the unit of radius in the graph of pressure vs radius. Usual we ...
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### Nuclear Energy is measured in MeV, why not in Joules? [duplicate]

Why it is preffered to measure Nuclear Energy in MeV insted of Joules?
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### Does a precise definition of the meter not involving light exist, so that variation of $c$ can be tested?

The second is defined as the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom. The metre ...
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### Units of Larmor frequency

I'm sorry if this is really basic, but what exactly is the unit of Larmor frequency? According to Wikipedia, the formula for Larmor frequency is: $$\omega = \frac{egB}{2m}$$ and with $g$ as a ...
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### Is there a standard, coded table of physical units?

I am a programmer in the medical/biosignals area, and I want to represent physical units in a database table. Ideally, I would like to have a code that uniquely identifies a given physical quantity. ...
215 views

### Why we only need three independent unit to describe physics?

From the article below, it is said that we can describe physics with only 3 independent units: length, mass, and time in cgs system/ velocity, action, and energy in natural units system. However, why ...
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### Definition of the Kilogram

I have been reading about how the SI kilogram has been defined throughout history. From what I understand, the kilogram was initially defined in terms of the mass of a specific volume of water at a ...
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### Is there a system of units that replaces time with light-distance?

I would like to start this by saying that my motivation for asking is that I find relativity very difficult to deal with using the SI system. It strikes me that the problem with this system is the ...