# Questions tagged [measurements]

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### How to average the loudness of a audio file from its amplitude?

I would like to average the loudness of different sounds so that their means could be used as a dependent variable in a statistical regression, but I have some troubles to understand how loudness ...
81 views

### Is there any experiment that doesn't have a finite countable number of outcomes?

There are a lot of random variables in physics that are, in principle, continuous and unbounded (canonical examples: time, position along each direction). In practice, it is my understanding that the ...
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### Is an atomic clock's measurement principle independent of what a light clock provides

Special Relativity has the light clock which basically counts how often a photon goes forth and back along a fixed distance. Our most accurate clock, defining the second (at least as of today), is an ...
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### Which program to analyse and graph laboratory measurements?

I'm interested in which program would you recommend for drawing graphs with x and y errors. Also to be able to analyse data and then graph it. My ideal graph would look like this: Until now I was ...
91 views

### How to check if a thing I have is exactly of 1 kg or not?

The definition of a kilogram is as far I know, Kilogram: The mass of a cylinder made of platinum-iridium alloy kept at International Bureau of Weights and Measures is defined as 1 kg. But it is ...
81 views

### How is the Length of a Meter Physically Measured

I have two parts to this question. First, I understand that the meter is defined as the distance light travels in 1/299,792,458 seconds. But how is this distance actually measured? The second is ...
146 views

### Accurate measurement of total lung capacity / vital capacity

I'm currently working on a practical problem: How to measure your total lung capacity and/or your vital capacity accurately. Any suggestions or experience? One of the methods that can be found with a ...
306 views

### Fractional uncertainty question

Q. A ball falls freely from rest with an acceleration g. The variation with time t of its displacement s is given by s = 1/2 gt^2. The percentage uncertainty in the value of t is ±3% and that in the ...
131 views

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### Estimate the body surface area [duplicate]

This is a question back when I was in the third year of my (junior) middle school. However I still do not know an elegant answer to it. The question is composed of a single line. Measure the body ...
246 views

### Are ‘fundamental measures’ a thing?

The question I want to ask is: What measures are needed to describe the physical world and what are the fundamental ones of those, in the proper sense of the word fundamental? But that might be too ...
38 views

### Is there a formal definition of what a significant figure really is? [duplicate]

What does it mean, formally, when we say that a digit in a number is a significant figure?
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### How do uncertainties in digital measurements work?

Suppose I stand on an electronic weighing scale, and it reports my weight as 74.5 kilos. Usually a lot of books would say that the last digit is uncertain, and that the uncertainty is 0.1kg, and that ...
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### Does the symbol $K$ mean anything besides kelvin in any context of this scientific paper on the second page on the chart? [closed]

I was looking at this scientific paper(https://arxiv.org/abs/1205.1684) and I saw them use the symbol "K" for a nemerical value, but due to the context of the paper I wasn't sure if they were talking ...
342 views

### How to measure a static electric field?

I looked up google but didn't find any design for measuring electric field that doesn't vary with time. My own idea is to use two parallel plates (like a capacitor but without the dielectric). In an ...