# Questions tagged [density]

Density is defined as the mass per unit volume of a substance.

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### Density of granulated cane sugar

What is the density in g/cm3 of cane sugar, for example in the following product: https://www.amazon.com/gp/product/B01LYMXK56 ?
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### van der Waals equation of state

I understand where the van der Waals equation originates from, but I am having trouble understanding why it underestimates liquid densities. Could someone please explain? And when is it not ...
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### Consider a cube of ice with volume equal to 3cm³ and a fixed density equal to 916g/cm3, How many of the molecules are in the surface of the cube? [closed]

This was a question that my fluid mechanics teacher ask today in class, I find the number of total molecules, and then my teacher says that we could search the size of one $\rm H_2O$ molecule, then I ...
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Assume that density of the body is less than the fluid. If we put a body in a given fluid the buoyant force equalise the weight of the body. If we increase weight, the buoyant force increase? If it ...
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### Total charge from a charge density

I was trying to calculate the total charge from a charge density that has a very strange form involving delta functions. The charge density is $$\rho(\vec r) = - \vec d . \nabla \delta(\vec r)$$ $d$ ...
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### Order balls by their density

I have a bunch of solid balls, each ball has a different diameter, a different mass and made from different material. I can compare if one ball is heavier than another ball or if one ball is bigger ...
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### Why the inner core of planet Earth is not composed of the densest materials?

I read on various sources the inner core of our planet is said to be mostly composed of a iron-nickel alloy, plus some lighter elements like silicon. On the other hand, I know that in general lighter ...
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### Why does a floating object displace more substance than a sunk object? [duplicate]

Consider a box floating on water having a coin on top, now suppose after some time by some external influence, the coin is dropped into water. After doing the calculations, to my surprise, I found ...
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### What are examples that will further explain the relationship of density to mass and volume, when mass is uniformly distributed? [closed]

Examples that will further explain the relationship of density to mass and volume, when mass is uniformly distributed.
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### Cross correlations between 2 sensors - Approximation of a 2D + 3D synthesis

I am interested, in the context of my work, in the cross correlations between a spectroscopic probe (which gives a 3D distribution of galaxies with redshifts, which is also called spectroscopic Galaxy ...
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### Will a plastic feel less heavy when I put it in a bucket of water and carry it?

If I'm carrying a bucket of water in one hand and a piece of plastic in the other, and then I decide to keep the plastic in the bucket of water (it floats). Will it feel less heavy in the second case? ...
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### A question on hydrometer

A constant immersion hydrometer floats vertically in water when the weight of its float is 30 g. When it is made to float in a liquid (miscible in water), the weight of its float is increased by 10 g. ...
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### Charge distribution and electric field on a conductive sheet

I have a sheet of paper, clad with a half-circle shape of conductive material. The half circle is not filled to the center. The inner radius is about 8cm, and the outer radius about 12cm, not that the ...
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### Why does the speed of sound decrease with increase in density?

In my book it's written that speed of sound will in increase with increase in density of the medium as molecules with get closer to each other, but after some browsing on internet I found out about ...
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### Body submerged in two liquids

A container has 2 immiscible liquid of different densities. Suppose water on botton and kerosene oil on top. A body floats at the boundary of both such that it is partly in water and partly in the oil....
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### Magnetic field energy in a coaxial cable

I came up with a conceptual problem when I was doing an exercise which involved calculating magnetic field energy in a coaxial cable. The cable consisted of one inner solid conducting cylinder ...
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### Free Fall with Drag and Varying Air Density

I am trying to plot a graph in Excel describing a free fall of an iron sphere dropped from an altitude of 12 km, while taking into account the different levels of air density affecting the drag. The ...
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### Water at temperature of 4° C [closed]

We know that the density of of water at $4°\rm C$ is maximum $1\rm\: g/cm³$. But how is it possible?? Suppose I have $1kg$ of water at $4°\rm C$ .So it's density is $1\rm\: g/cm³$. But what if the ...
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### How to calculate thermobaric heating and decelleration when object go from space into atmosphere (2D)

I'm making 2D game where ship landing from space to planet. I want to add atmosphere to planets with gradient density depending on height. And I want to use this atmosphere for converting object speed ...