# density's questions - Chinese 1answer

0 density questions.

### -3 What is the real definition of density? [on hold]

1 answers, 62 views mass definition density volume
What does density really mean? Everyone just provides me with the equation of finding density whenever I ask this question.

### At what rate does the typical human body sink in a swimming pool? [closed]

Let's say I'm $1.8\ \rm m$, $70\ \rm kg$ with a fairly typical male body shape. I hold on to the side of an otherwise normal but very deep swimming pool, then lower myself so that the top of my head ...

### -2 If we have density and mass why should we have gravity?

In a cup filled with different solutions with different densities if we put objects of different masses they will sink to different layers ... and this can be explained by mass and density so what is ...

### Finding density using bulk stress equation

Basically, I'm using the equation $\frac{F}{A} = -B\times \frac{\bigtriangleup V}{V_o}$. Originally I had to find the change in volume given an initial volume (B and pressure ($\frac{F}{A}$) were ...

### -1 Commercially available material with highest density to cost ratio? [closed]

2 answers, 53 views mass atoms density molecules elements
What are the top 5 commercially available materials (not limited to just the elements) with the highest density to cost ratio? To point to an application, say that my goal was to mass produce a solid ...

### 3 Why do all the planets and stars in our solar system have such similar average densities?

This table lists the average density of all the planets in our solar system. We could also consider the Sun (average density 1.41 g/cm³) and Pluto (average density 1.88 g/cm³). The densest body (Earth)...

### -1 How can volume be zero and density infinite? [duplicate]

We all learned in high school physics that volume can never reach zero. A theory and a fact that I easily understood. But right now I'm studying: ... The remnant then collapses to a black hole—a ...

### 2 What is the highest density to be measured?

In the abstract of the recent article named "Transport properties and equation of state for HCNO mixtures in and beyond the warm dense matter regime" we can read that authors measured a density of 36....

### -2 Why does oil float on water?

This might be a silly question but I want to know why oil actually floats on water. I tried to explain it to myself using Archimedes' principle but that didn't help. Archimedes’ principle, ...

### Density and refractive index of Water/sugar solution

I can't find a correlation or equation for refractive index of water and sugar solution of known density. Do you know where to find it?

### 1 Diamond ring around black hole

1 answers, 72 views black-holes speed-of-light density
I know that light takes longer to travel in a denser material, like diamond and I know that black holes also attract light. I was wandering what would happen if you would make a ring out of diamond, ...

### Measuring local properties in a suspension

0 answers, 8 views fluid-dynamics acoustics density
Considering a fluid with a certain known concentration of particles (eg: 40% per volume RBCs in blood plasma), how do I measure analytically the speed of sound in the medium and its density? i.e. ...