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Physics

Questions tagged [si-units]

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

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-6votes
3answers
165views

We say 1 meter per second to express 1 meter covered in 1 second. Why can't we say 1 watt per second when 1 watt is used in 1 sec?
2votes
1answer
152views

One ampere corresponds to the flow of approximately $6.241 509 074 × 10^{18}$ elementary charges passing a cross-sectional area in one second as per the 2019 revision of SI, fixing the elementary ...
17votes
6answers
2kviews

Multiplication and division of units of measurement seems to be defined, e.g., $\mathrm{N}\times\mathrm{m}=\mathrm{N}\text{-}\mathrm{m}$, m/s = m/s (a rather unsatisfactory example---help)....
2votes
0answers
89views

Cosmic strings are characterized by their dimensionless tension, $G\mu$. Their mass per unit length $\mu$ is given by the square of the energy scale of their formation. For strings formed at the ...
-5votes
2answers
326views

I stumbled upon this list of Planck units; what surprised me was how temperature could be defined as Acceleration*Charge/2π.gp = Planck acceleration, e = elementary chargeThis derivation would ...
1vote
0answers
111views

I often find myself wanting to know the dimensions of large-ish expressions. Something like $\frac{e^2}{4\pi m \omega^2 \epsilon_0}$ say. I know I can evaluate this by hand, but I'd really enjoy some ...
6votes
4answers
1kviews

I have recently been thinking a lot about foundational quantities in physics and chemistry (I study chemistry as an undergraduate), and how to define them.It seems quite easy to define at least time ...
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3votes
1answer
241views

For converting a $\text{Newton}$ into a $\text{Dyne}$, we can simply use $nu = \text{constant}$ where $n$ is the magnitude and $u$ is the unit.A similiar method can be used to convert all SI units ...
0votes
1answer
153views

I'll start by saying that I'm more oriented towards the math community and I hope to write a good question.ContextI'm taking a quantum mechanics course where the professor is using a convention ...
Math Attack's user avatar
3votes
3answers
393views

I see 'mass flux' and 'mass flow rate' both used for the same system (ex: Mass flux across a volume).From various sources it seems like 'mass flux' should have SI units $\mathrm{kg \times s^{-1}\...
4votes
2answers
237views

I understand why we might expect to see a $4\pi$ in $\mu_0$, given that we see relationships between geometry and natural phenomena, like with Gauss's law giving us $k_e = \frac{1}{4\pi\varepsilon_0}$ ...
4votes
2answers
162views

I've learned in statistical mechanics that $\beta = \frac{1}{kT}$, which, in natural units, simplifies to $\beta = \frac{1}{T}$. When I started studying thermal field theory, it seemed that this ...
6votes
6answers
4kviews

If I accelerate by 10 meters per second, that means that I am accelerating by 20 meters per 2 seconds.Plug this into the currently accepted formula:20 meters / 2 seconds squared. So that means I am ...
0votes
0answers
130views

I’m somehow confused about the units conversion for some quantity, so any help is much appreciated. Suppose:$\rho = k^2 H^2 t^2,$where $k^2 $ and $t^2 $ are variables, $k$ is in unit Hz and $t$ is ...
10votes
3answers
1kviews

If both sides of the Einstein field equations need to have the same measurement units, how can the coefficient of the energy momentum tensor convert all of the units of the energy momentum tensor (...

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