Questions tagged [volume]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1
vote
1answer
34 views

What causes increment in volume when compressive forces are applied on an object

Doubt When compressive forces are applied on a body, what causes increment in volume. According to me the volume should remain constant since the mass and density of body are constant.
0
votes
2answers
37 views

2 gallon tank pressurized to 100 psi connected with a tube to a tractor tire with only 30 psi

2 gallon tank pressurized to 100 psi connected with a tube to a large tractor tire with only 30 psi. And the air does not move from tank to tire. Why? Can anyone link a YouTube video to explain ...
1
vote
1answer
30 views

How does the melting ice cube in a glass of water doesn't change the water volume? [duplicate]

that's problably a very noob question, and answer that i found is: the water volume was always the same, what is kinda obivius, but doesn't seen enought to me. So I can't stop thinking, were did the ...
1
vote
0answers
15 views

Force acting on a cube on all sides [closed]

A metallic cube of length L is stretched out uniformly by force F normal to each of its faces. Given Young's modulus and Poisson ratio, what is the deformation in the cube?
1
vote
0answers
42 views

Can you plot irreversible but quasi static processes on a $pV$ diagram?

I've often heard that you can't plot irreversible processes on a $pV$ diagram, but what about in the case where you have a quasi static process with friction? There still exists a curve of ...
0
votes
0answers
9 views

Does multiple outlets (at same level on tank) from an overhead tank increase pressure?

I have a tank that is about 1foot high from my shower, however the pressure(or volume) isn't sufficient. Is it possible to increase the pressure(or volume) at the showerhead by doing the following: ...
2
votes
2answers
51 views

When differential of $p$-$V$ $dW$ work equals $-pdV$?

The differential form of the first law takes the form $$dU=\delta Q + \delta W$$ or $$dU=TdS-pdV.$$ First, we know that $TdS=\delta Q$ for reversible process. So we can't say that $dU=\delta Q -pdV$. ...
2
votes
3answers
48 views

What causes volume of sound to decrease with distance?

I know about the inverse square law however I do not know why it actually decreases. Does it have to do with sound absorption, it runs out of energy so the vibrations lessen or as distance increases ...
0
votes
1answer
33 views

Why do some textbooks use $T$-$V$ diagram for temperature table instead of $p$-$V$ diagram?

I am confused about this thing. In the temperature table, the first column explains specific temperature and the second column explains corresponding saturation pressure. From what I understand, if ...
0
votes
2answers
62 views

Why is tire pressure lower when parking and higher while driving (and not rise more when driving faster)?

I just noticed this whenever I park the car for a while, the tire pressure goes to a lower value on all tires, and whenever I start driving, it goes higher. The difference is not so big, but it is ...
2
votes
1answer
106 views

Lost volume data of water and isopropanol mixtures [closed]

WHO has two recipes for disinfecting, based on ethanol and isopropanol (IPA). They typically start with an alcohol volume and then top it off with the other ingredients to 10 litre. One of the recipes ...
1
vote
1answer
30 views

Crossings in the $p$-$V$-diagram of Thermodynamic cycles

Today I was tasked with correcting and grading a first year thermodynamics exam and one student drew a very peculiar diagram for the Ericsson-cycle. In the p-V-diagram the isothermal expansion and ...
1
vote
2answers
125 views

Time period of piston performing SHM

Suppose I have a closed piston-cylinder system which contains an ideal gas,and it is being compressed adiabatically by the piston which has a vertical orientation,and in doing so,the piston is ...
0
votes
1answer
39 views

How can a Diesel motor be drawn on a $pV$-diagram?

Only quasi-static processes can be drawn on a PV-diagram, because during a quasi-static process thermodyanamic variables such as pressure $p$ and volume $V$ are well-defined. However, for example, the ...
1
vote
0answers
22 views

What Are The Physics and Air Pressure Effects of Extremely Large Bells

How would one go about figuring out the physical properties of when a bell is hit. Can I parameterize the diameter of the bell, its height, and the kinetic force of the knock to get the volume in ...
0
votes
0answers
10 views

How does the distribution of entropy in the expanding universe evolve? [duplicate]

Also, Is the entropy divided by the volume of the (observable) universe increasing with respect to time or is that number decreasing, unstable, or constant, or infinite?
3
votes
1answer
101 views

Intuition of $dV$ in $PdV$?

I seem to have some misunderstanding of $PdV$ in the first law of thermodynamics. $$ P dV = T dS - d U $$ I have a ballon. I apply some work (or change the temperature inside the balloon). Now, ...
2
votes
1answer
54 views

Particle states per phase space volume of a quantum gas

Consider a quantum gas in a box with volume $V=L^3$ and temperature $T$, consisting of spinless bosons. Explain why the number $dN$ of "single-particle states" in a "momentum space volume" $d^3p$ is ...
1
vote
3answers
134 views

Boyle's Law and hot air balloon

A bit dumb question because it is really difficult to imagine it. :- Pressure is force per area. Talking about gases, the pressure is said to be the force molecules exert on walls of let's say a ...
3
votes
2answers
87 views

What does it mean for the Lorentz Transform to preserve areas?

If we look at the Lorentz Transform from some frame $S$ to some frame $S'$ moving relative to $S$... $$\begin{bmatrix} \gamma & -\gamma v\\ -\frac{\gamma v}{c^2}& \gamma \end{bmatrix}\begin{...
0
votes
0answers
22 views

Change in entropy due to the change in volume

If its given that $N$ no of Ideal gas atoms are in $V$ volume. What will be the change in entropy in units of $N\cdot kb\cdot\ln2$ when the volume is increased fourfold, i.e. $V \to 4V$, keeping ...
0
votes
0answers
34 views

Demonstration of comoving volume between 2 redshifts

1) I can't manage to find/justify the relation (1) below, from the common relation (2) of a volume. 2) It seems the variable r is actually the comoving distance and not comoving coordinates (with ...
0
votes
0answers
31 views

What is the volume inside the inner event horizon of a Kerr black hole?

(Dokuchaev 2011) found periodic orbits of particles and photons inside a Kerr-Newman black hole with a maximally extended global geometry. They orbit inside the inner horizon $r<r_-$ where the $r$ ...
-1
votes
2answers
43 views

Pressure and volume [closed]

Currently, I am working on this experiment where I hit a balloon with a small object so that the pressure inside a balloon changes. The pressure increased when I hit the balloon, but I need to ...
1
vote
3answers
81 views

Dilemma of volume displaced by an object

I have 2 questions, the second question is based on the answer of the first question 1.)When an object floats, is the volume of the object submerged and displaced water equal? 2.)So if volume ...
1
vote
1answer
138 views

What has mass but do not take up space?

Loosely speaking matter is anything that has mass and takes up space... so photon has no (rest) mass and I don't know if it takes up space but it already been disqualified due to failing to meet ...
0
votes
2answers
77 views

What is water's center of mass?

Suppose there is a cube filled with water of height $h$. Where would the center of mass be? I would assume that since water is denser where it is deeper, the center of mass should move toward the ...
5
votes
3answers
1k views

Can we change the volume of a wire by applying force on it in order to stretch it, if yes is there any way to calculate it?

Can we change the volume of a wire by applying force on it in order to stretch it, if yes is there any way to calculate it ??
1
vote
1answer
40 views

Semiclassical volume of a single photon

An electromagnetic plane wave propagating in the +z direction with $\vec{E} = E_0cos(\vec{k}\cdot\vec{r}-wt)\hat{x}$ and $ \vec{B} = \frac{E_0}{c}cos(\vec{k}\cdot\vec{r}-wt)\hat{y}$. Let us now model ...
0
votes
3answers
57 views

About an adiabatic stroke in the Carnot cycle

In one of the adiabatic stroke in the Carnot cycle, the temperature of the gas reduces from T1(to what it was initially heated) to T2(temperature of the surrounding). How exactly does the internal ...
0
votes
1answer
35 views

If water vapor changes its phase, how is it possible to maintain specific volume?

I was doing my thermal engineering exercises when I encountered a problem. The problem specified a fixed and rigid container with a volume $V=0.17\ m^3$, as I have a $T-S$ diagram for water, they give ...
1
vote
1answer
31 views

Fluids mixture density prediction

As you know 100 ml of H2O mixed with 100 ml ethanol is not 200 ml What is the official name of this 'volume loss'? Is it possible, and if so, how, to calculate, before mixing, what the density of a ...
2
votes
1answer
173 views

What is the length of the yarn in a ball of yarn? [closed]

The image https://commons.wikimedia.org/wiki/File:Ball_of_yarn_10.jpg shows a typical ball of yarn. Such a spherical ball of radius $R$ has a volume $4πR^3/3$. The radius of the yarn is $r$. How long ...
1
vote
1answer
48 views

Related to the Second Law

It is impossible to cross two adiabatic curves. Could someone better justify me why? Is it something related to the Second Law?
0
votes
3answers
135 views

Volume form in terms of the Levi-Civita Symbol

I'm currently reading Sean Carroll's book on General Relativity, and at some point he writes: First notice that the definition of the wedge product allows us to write \begin{equation} \mathrm{d}x^...
0
votes
0answers
25 views

What is the volume of water in an inclined pipe

Diagram: I have a tank of water T, which was filled with 2000l of water. At some point along the pipe connected to it, there is a leak, which is leaking at the rate of 400l/24 hours. Valve d and j ...
0
votes
1answer
143 views

Work done to compress a liquid in container [closed]

Into a compressed container containing water with pressure p and volume V we want to pump additional water. What is the work done? Unlike in the ideal gas, the work cannot be simply found out using ...
2
votes
3answers
88 views

Why does PV work consider total pressure instead of net pressure?

In physics, we define work as: $$W = F_{net}×d$$ However, in physical chemistry, PV work is calculated as: $$W = P×ΔV$$ Why is total pressure used instead of net pressure? For example, if a gas is ...
0
votes
1answer
33 views

Typical balloon volume-pressure law

I need to find the gas pressure required to make a balloon take a given volume, knowing the gas densities and atmospheric pressure. Is there a typical law/correlation that can be used to approximate ...
1
vote
2answers
70 views

How do you define volume for gases? [closed]

Straight forward question. If atoms forming a gas float far from each other, how can we assign a volume to it? if it is in a container, perhaps we'd say the atoms, or molecules, reach every corner and ...
0
votes
1answer
87 views

Black hole mass

It has been taught to us that since the black holes have finite mass, their gravitational force is also finite, which totally fits. The Black hole anyhow has a singularity at it's center which is ...
0
votes
1answer
64 views

Converting Gas volume to Liquid Volume

For a test setup, I need to set CO2 flowrate as 130 L/h but I do not have a flow measuring device to set it. So I made one device as mentioned below. Once I set the flowrate, I will remove containers/...
2
votes
2answers
107 views

How can I compute the missing volume by looking at the pressure changes?

Disclaimer: I'm not in any shape used to deal with physics and forgive me in advance if this question is either out of scope of wrongly formulated. I have a very practical problem. I have a container ...
2
votes
1answer
83 views

Can I tell whether a cycle is reversible or not by the $p$-$V$ diagram?

A thermodynamic process is reversible if the system remains in the equilibrium state throughout. That's what we are told in the book. My doubt is, though, can we judge whether a process is reversible ...
1
vote
1answer
108 views

Question about using Liouville's theorem to calculate time evolution of ensemble average

With the Liouville's theorem $$\frac{{d\rho }}{{dt}} = \frac{{\partial \rho }}{{\partial t}} + \sum\limits_{a = 1}^{3N} {(\frac{{\partial \rho }}{{\partial {p_a}}}\frac{{d{p_a}}}{{dt}} + \frac{{\...
1
vote
0answers
31 views

Calculating infinitesimally small volume of a sphere in velocity space

This link (at the end of the page) is deriving the formula to calculate an infinitesimally small volume $dV$ on the surface of a sphere with radius $v$ in velocity space. It states that $dV = ...
2
votes
3answers
395 views

Shape of isotherms in $P$-$V$ phase diagram

Please explain the shape of the isotherms in this P-V phase diagram. In particular, why are the isotherms flat in the liquid-vapor region? (image from Lumen Learning | Physics | Phase Changes)
0
votes
3answers
71 views

$pV$ work and Specific volume [closed]

I am working on a $pV$ work exercise. I am given $P_1$, $P_2$, and $V_1$; we can solve for $V_2$. I am also given mass. I am told that the $pV$ relationship is $pv^{1.2}=const.$, where $v$ is ...
0
votes
3answers
90 views

Energy Density is expressed in Liters, Liters of What?

When looking at energy density of batteries it is often expressed as Wh/L. For instance, Wikipedia says Lithium Ion batteries have a density of 250–693 W·h/L. Liters is supposed to express the volume ...
1
vote
2answers
195 views

What is the volume occupied?

What is the volume occupied by 1 mole of gas at $10^{−10}$ torr, the pressure inside an “ultra high vacuum” (UHV) chamber. How do I solve this problem without being given the temperature?

1
2 3 4 5 6