# Questions tagged [unit-conversion]

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### How to convert dBm/MHz to dBm?

I wonder if we can convert dBm/MHz (eirp) to dBm? For example: What is the equivalent of -30 dBm/50MHz as dBm? Edit 1: I wonder if power spectral density (dBm/MHz) can be expressed in dBm. In EN 302 ...
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### CGS Units for Magnetism

Why does the formula for magnetic field force include the speed of light in the denominator in cgs units? Where does the extra $c$ go in SI units?
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### How do Becquerels relate to Grays?

I understand that becquerels are SI units for curies, and that curies are a measurement of radioactive decays per second. I understand that gray is the measure of uncharged ionizing rays in a sample ...
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### Unit Conversion with Temperature and Mixed Dimensionality

So, I understand the relationship between K(Kelvin), R(Rankine), C(Celsius), and F(Fahrenheit), and the complications of converting between them (i.e. varying meaning of zero). However, when ...
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### Banana vs Brazilian Nuts Radiation

Looking online I can find that the BED (Banana Equivalent Dose) is around 0.1uSv, but Brazilian Nuts can have up to 444Bq/kg. I know both of those foods are safe, I just wanted to understand how ...
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### How to convert $V/A$ (Volts/Ampere) data to $T/s$ (Tesla/seconds)? [closed]

I have a list of time domain electromagnetic data that I need to invert, but the equipment provides the data in V/A and the software to invert need it in db/dt [T/s]. Would someone help me, please?
166 views

### How to measure vacuum permittivity?

In this question, the first answer (though I don't completely understand that answer) states that $\epsilon_0$ is the proportionality constant in Gauss' law. If that's the case why isn't it assumed to ...
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### Natural unit conversions within HEP

In HEP, with the $$\hbar = c = 1 \;.$$ We have $$\hbar c = 200 \;\mathrm{MeV \cdot fm}$$ 1 second is equivalent to $10^{-25}$ GeV. How these relations are used to convert seconds to GeV, GeV to ...
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### For vibrations in continuous beam, what is the unit of eigenvalue?

I have been solving a fourth order euler bernoulli differential equation to solve for vibrations of a continuous cantilever beam. When I verified for them using Comsol eigenvalue solver, it gives me ...
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### Conversion formula between attenuation coefficient (cm^-1) and (dBcm^-1MHz^-1)

So, I was presented in class the fact that (at least in Ultrasound), attenuation coefficients $\mu$ can be expressed in units $\text{dBcm}^{-1}\text{MHz}^{-1}$ as opposed to the form I was used to; ...
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### How is the Time Derivative of the the Electric Field Equal to the Current Density in Gaussian Units?

The microscopic form of Ampere's law with the Maxwell addition in Gaussian units states, \begin{equation} \nabla \times \vec{B} = \frac{1}{c} \left ( 4 \pi \vec{J} + \frac{\partial \vec{E}}{\partial ...
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### MW@kV conversion

First, I'm sure this question is way too easy for this forum but I didn't find a better one. I'm having an argument on the following and we'd like to settle it officially. On a website about Diesel-...
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### Confusion on the cgs, Heavside-Lorentz and SI system

I am very confused about three measuring systems: cgs, Heavside-Lorentz (never used) and SI ...
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### Dimensional Analysis in Electromagnetism (SI vs Gaussian-cgs)

Looking at Konopinski's formula for conjugate momentum (in the comment after equation 3 of "What the Vector Potential Describes"): $\mathbf{p}= M \mathbf{v} + q\mathbf{A} /c$ it is plain enough that ...
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### Unit confusion - How Pressure and Volume combines to Joule

Imagine some helium in a cylinder with an initial volume of $1$ liter ant initial pressure of $1$ atm. Somehow the helium is made to expand to a final volume of $3$ liters, in such a way that its ...