# Questions tagged [scales]

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### "Kilogram" confusion: If you weigh a stationary object in "kilograms" and divide the result by about $9.8$, does that tell you the mass of the object?

Update: I appreciate all of the answers very much In a way, I'm delighted to find that such a simple question has generated so much disagreement (most of which can be attributed to issues with wording,...
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### Does the minimum connection time of ocean surface currents depend on the patch scale?

The Nature paper "The timescales of global surface-ocean connectivity" attempts to model "minimum connectivity times (Min-T), or distances based on the fastest times that particles can ...
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### What is the difference between scale invariance and scale free?

A question several years ago asked, "What is the difference between scale invariance and self-similarity. It appears that a new term has become popular in recent years, which is "scale ...
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### Proof of X-LFP/UFP-LFP=constant for all scales of temperature

I came across this formula to convert from one unit of temperature to another. I could not find any proof for this though. In the formula, 'X' is the temperature value to be converted, 'UFP' is the ...
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### Scale invariance at phase transitions

The Wikipedia entry for scale invariance states In statistical mechanics, scale invariance is a feature of phase transitions. The key observation is that near a phase transition or critical ...
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### What is the Planck scale magnetic field strength?

Using the constants $\mu_0$ (or $\varepsilon_0$), $c$, $\hbar$, $e$ and $G$, it is possible to define two quantities with units of magnetic field : \begin{align} B_1 &= \sqrt{\frac{\mu_0 c^7}{\...
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### What would a regular bathroom scale indicate as it's sinking underwater

It seems intuitive that a (waterproofed) spring-based scale placed at the bottom of a lake would indicate the weight of the water column above it. But assume the scale sinks from the surface of the ...
101 views

### Balanced forces in scales

We have scales-like mechanism with a spring. Rigidity of the spring $C=10\ \mathrm{kg/cm}$, initial length $L_0=60\ \mathrm{mm}$ and diameter $d=\ \mathrm{10mm}$. Without any weight the scales are in ...
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### How can physicists observe events at large scales such as a star birth?

I read recently multiple articles about physicists observing the birth of a star, or a star swallowed by a black hole. However I can't manage to understand how these phenomena are observable at such ...
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### How can a beam balance measure mass?

In Newtonian physics, mass is the amount of matter in an object. So, how can a beam balance measure the amount of matter in an object (which is the mass of the object).
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I'm trying to work through, understand, and apply concepts regarding mass models of galaxies. Looking at the Hernquist model, I'm finding the equation $$Φ(r)=−\frac{GM}{r+a},$$ where a is the scale ...