What is Volume: Definition and 1000 Discussions

Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or 3D shape occupies or contains. Volume is often quantified numerically using the SI derived unit, the cubic metre. The volume of a container is generally understood to be the capacity of the container; i.e., the amount of fluid (gas or liquid) that the container could hold, rather than the amount of space the container itself displaces.
Three dimensional mathematical shapes are also assigned volumes. Volumes of some simple shapes, such as regular, straight-edged, and circular shapes can be easily calculated using arithmetic formulas. Volumes of complicated shapes can be calculated with integral calculus if a formula exists for the shape's boundary. One-dimensional figures (such as lines) and two-dimensional shapes (such as squares) are assigned zero volume in the three-dimensional space.
The volume of a solid (whether regularly or irregularly shaped) can be determined by fluid displacement. Displacement of liquid can also be used to determine the volume of a gas. The combined volume of two substances is usually greater than the volume of just one of the substances. However, sometimes one substance dissolves in the other and in such cases the combined volume is not additive.In differential geometry, volume is expressed by means of the volume form, and is an important global Riemannian invariant.
In thermodynamics, volume is a fundamental parameter, and is a conjugate variable to pressure.

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  1. G

    Boiler volume for specific steam turbine?

    New here, hope someone can help. I'm experimenting with a heat source for a steam turbine. I have the specs for the turbine and the necessary conditions for operation, but at this point in my design I need to figure out the volume of the actual boiler/reservoir. A direct answer or the right...
  2. R

    Visualizing Volume Between Surfaces to Using Double Integrals

    Hey guys. So I've been trying to learn Double Integrals on my own and I'm at Volume between surfaces...so googling some worksheet problems I came across the one and I'm a bit confused. 1. Homework Statement Let U be the solid above z = 0, below z = 4 − y^2, and between the surfaces x = siny...
  3. Oannes

    Finding Surface Area in square feet with Volume & Thickness

    Homework Statement How large a surface area in units of square feet will 1 gallon of paint cover if we apply a coat of paint that is 0.1cm thick? Homework Equations Since Volume is L * W * H and we can assume the object is square besides the height which in this case will be the thickness. So...
  4. J

    MHB Compare volume formula to integration

    So I need to compare the results of the volume formula of a cylinder to the results of the integration. In geometry, you learn that the volume of a cylinder is given by V = πr2h, where r is the radius and h is the height of the cylinder. Use integration in cylindrical coordinates to confirm the...
  5. D

    Volume of Object with Diameter 0.184 cm & 0.916 cm, Height 2.33 cm & 13.6 cm

    Hello, I'm very new to physics & I've been stuck on this question, which seems pretty straight forward, for so long that I had to ask you guys :(. - d, (the diameter of the hole) is 0.184 cm - D (the diameter of the cylinder) is 0.916 cm - h (the height of the hole) is 2.33 cm - H (the height...
  6. B

    Trying to calculate the volume of gas flowing through a nozzle

    I've gone through many posts but haven't really come across something very clear. And on top of it my knowledge of fluid dynamics only extends to compressible fluids. I have a Nitrogen Cylinder Tank, with an exit pressure of 214.7 psia which is blocked by a solenoid valve at a location very...
  7. E

    Enthelpy Transformation: P=Constant, ΔH=Q?

    In a trasformation in which P=costant, but internal pressure is different from external pressure, ΔH=Q? I'm asking this question because I know that Q=ΔU+PΔV (where P is the external pressure) and H=U+PV (where P is the sistem pression, so the internal pressure) Am I right?
  8. B

    Please prove that dW=-vdP where v is specific volume

    Homework Statement I came across this equation denoting the work done by an open system (e.g. turbine or compressor). I wonder how they arrived at such an equation. Homework Equations Differential form of the steady flow energy equation for an infinitesimally small control volume neglecting...
  9. BTBlueSkies

    I Volume vs Circumference of Massive Body

    Volume vs Circumference of a massive body. In the spacetime diagrams it is often shown that the space around massive bodies is warped in a way that seems to indicate the actual volume of a massive body is larger than 4/3 pi r^3. If you measure the radius from the circumference by traversing it...
  10. B

    Volume magnetization currents - derivation confusion

    Hello there, I've just been learning about surface magnetization currents circulating around hypothetical square loops. Since the magnetization is uniform the circulation currents cancel where the square loops are adjacent to one another and it can therefore be said that the current circulates...
  11. N

    MHB How to Maximize the Volume of a Cylinder with a Given Perimeter?

    it is given that the perimeter of the rectangle is (80 + 120 + 80 + 120) = 400 cm From this you need to make a cylinder with maximin volume: 400 = 2r + 2h 2h = 400 - 2r h = 200 - r . We wish to MAXIMIZE the total VOLUME of the resulting CYLINDER V = πr^2 h However, before we differentiate the...
  12. N

    MHB Maximizing Volume of Rectangular Prism with 120cm x 80cm Sheet Metal

    My question is that I have to find the dimensions of a rectangular prism (cuboid), where none of the faces are square that will maximise its volume. The sheet metal I have to build it from is 120 cm by 80 cm. I don't even know where to start, I can do it if I'm given a height, width or length...
  13. T

    Relationship between Pressure and volume with Air

    Hey guys! So the below question might sound like a homework question but in reality it is an oversimplified explanation of what I'm trying to measure Let's say we have a perfect machine that pushes out 600CFM into a box. On the other end of the box is another small machine that only consumes...
  14. Prasun-rick

    I Volume of sphere using integration?

    Is it possible to find the volume of a sphere(i know the formula) using definite integration ? And if possible how to proceed ?? Thanks in advance
  15. Kirito123

    Volume of Cylinders: Find V w/ Pi r2h

    Homework Statement Homework Equations V= Pi R2H The Attempt at a Solution V = Pi r2h They gave us the radius and the height (the length can be used as height). They Diameter is 0.9 to find the radius I just divide by 2 = 0.45. So now I find the volume of the cylinder using the formula “V=...
  16. Kirito123

    Finding volume of Square pyramid

    Homework Statement Homework Equations V= a21/3 h The Attempt at a Solution I may be wrong or right I don't know. I'm pretty sure I did it right.
  17. S

    MHB Find Volume of Revolved Region: [-pi/2, pi/2] & y= cos x & y = -cos x

    Find the volume of the solid generated by revolving the region enclosed by y= cos x and y = -cos x for [-pi/2, pi/2] about the line y=2pi.
  18. M

    Liquefied Petroleum Gas (GLP) Volume in Tanm

    Hello. I am having some trouble with a work related problem. I have a GLP tank of 5000 litres capacity, and we actually have a pressure gauge on it measuring that the gas pressure on top of the liquid is above tolerance. Based only on that data, we need to measure the volume that is being taken...
  19. D

    Designing a 5L Football for the MFL

    Homework Statement You have been employed but(sic) the Mathematics Football League (MFL) to design a football. Using the volume of revolution technique, your football design must have a capacity of 5L ± 100mL. You must present a statement considering the brief below. Just a quick side note, I...
  20. G

    B Calculating Volume of an Arbitrary Pyramid

    I am trying to gain some understanding from this article regarding deriving the volume of an arbitrary pyramid. "An arbitrary pyramid has a single cross-sectional shape whose lengths scale linearly with height. Therefore, the area of a cross section scales quadratically with height, decreasing...
  21. S

    Thermal expansion of liquid in a tube

    Homework Statement A cylindrical glass tube (linear thermal expansion coefficient ##\alpha##) contains liquid (volume thermal expansion coefficient ##\beta##). The height of the tube is ##h_{t,0}## and the height of the liquid inside of it is ##h_{l,0}##. If the temperature changes of an amount...
  22. H

    Why Reynolds Stress vanishes on boundary of closed volume?

    The rate of working of the Reynolds Stress can be written as: where ui is the fluctuating velocity and Ūi is the time-averaged velocity. It is stated in the textbook that, if we integrate the above equation over a closed volume V, the divergence term on the left integrates to zero since τRij...
  23. D

    How Is Heat Calculated for an Ideal Gas at Constant Volume?

    Homework Statement An ideal gass is at constant volume risen to a new pressure level of ##P_f##. Find te expression for the total heat brought to the system. Homework Equations 3. The Attempt at a Solution [/B] So ##PV=nRT## and ##E=Q## ##Q=C_v(T_f-T_i)## so i just have to find...
  24. ChrisVer

    A Mean volume of sphere (normal distributed radius)

    I read in http://www-library.desy.de/preparch/books/vstatmp_engl.pdf page 29 (43 for pdf) that the mean volume is: <V> = \int_{-\infty}^\infty dr V(r) N(r| r_0,s) I have two questions. Q1: why do they take the radius to be from -infinity to +infinity and not from 0 to infinity? Q2: is there an...
  25. Destroxia

    Volume Integration Around Non-Coordinate Axis

    Homework Statement Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the line x = 5. (Use disk method) $$ xy = 3, y = 1, y = 4, x = 5 $$ Homework Equations [/B] The formula using for disk method is of the form: $$ \pi \int...
  26. amjad-sh

    I Volume in K space occupied per allowed state

    An allowed state of a molecule in a gas that is in a box of length L can be represented by a point in 3 dimensional K-space, and these points are uniformly distributed.In each direction points are separated by a distance π/L. A single point in K-space occupies a volume (π/L)^3. The number of...
  27. Firye Stanly

    Identify Gas Based on Specific Heat Formula and Universal Gas Constant R

    Homework Statement For some gas specific heats for constant pressure and constant volume are calculated. Universal gas constant is R. Find the formula the helps identify the gas. Include only constants and given information. Homework Equations 3. The Attempt at a Solution [/B] Molar specific...
  28. E

    I Bounding the volume distortion of a manifold

    Let $U$ be a compact set in $\mathbb{R}^k$ and let $f:U\to\mathbb{R}^n$ be a $C^1$ bijection. Consider the manifold $M=f(U)$. Its volume distortion is defined as $G=det(DftDf).$ If $n=1$, one can deduce that $G=1+|\nabla f|^2$. What happens for $n>1$? Can one bound from below this $G$? If...
  29. D

    Find ph based on given volume and molarity of HCl and NaOH

    Hello! I am trying to crack the following problem: What is the pH of a solution formed by mixing 125.0 mL of 0.0250 M HCl with 75.0 mL of 0.0500 M NaOH? Here is how I am approaching the issue: both HCl and NaOH are strong acid and base respectively. Hence the concentration of [H3O+] =...
  30. J

    Water level involving Density, mass, volume, radius

    Homework Statement A small solid sphere of mass M0, of radius R0, and of uniform density ρ0 is placed in a large bowl containing water. It floats and the level of the water in the dish is L. Given the information below, determine the possible effects on the water level L, (R-Rises, F-Falls...
  31. ElijahRockers

    Measuring volume: Solid vs Liquid/Gas

    I was just curious... what is the practical reason behind having two separate units for measuring volume? For instance, we can use cubic centimeters and mL interchangeably in practical medicine, i.e. injections. But we tend to use cubic (centi)meters for solids, and liters for liquids/gasses...
  32. CAH

    Volume of revolution in the first quadrant?

    Homework Statement Find the volumes of the solid formed when each of the areas in the following perform one revolution about the X axis... Question: The volume line in the first quadrant and bounded by the curve y=x^3 and the line y=3x+2. Homework Equations Volume of revolution about X-axis...
  33. Kerrigoth

    Why Is My Calculated Volume Different from the Textbook's Answer?

    Homework Statement The total area between a straight line and the parabola is revolved around the y-axis. What is the volume of revolution? According to the book, the answer is ; My answer comes out to be Homework Equations The Attempt at a Solution 1. Rewrite the second equation in...
  34. V

    Gravitational pressure dependence on volume

    Homework Statement Homework EquationsThe Attempt at a Solution Consider a very thin shell of width dr at a distance r from the center . The volume of this shell is ##4 \pi r^2 ## . Mass is ## m = 4 \pi r^2 \rho## . P is the pressure at distance r . Gravitational acceleration at distance r <...
  35. E

    B Using infinitesimals to find the volume of a sphere/surface

    I've always thought of dxat the end of an integral as a "full stop" or something to tell me what variable I'm integrating with respect to. I looked up the derivation of the formula for volume of a sphere, and here, dx is taken as an infinitesimally small change which is multiplied by the area of...
  36. P

    MHB Effie's question via email about a volume by revolution

    To start with, we should find the points of intersection of the two functions, as these will be the terminals of our regions of integration. $\displaystyle \begin{align*} 2\,x^2 &= x + 1 \\ 2\,x^2 - x - 1 &= 0 \\ 2\,x^2 - 2\,x + x - 1 &= 0 \\ 2\,x\,\left( x - 1 \right) + 1 \,\left( x - 1...
  37. P

    MHB Brenton's questions via email about volume by revolution

    Q5. Here is a graph of the region to be integrated and the line to be rotated around. First we should find the x intercept of the function $\displaystyle \begin{align*} y = 3 - 4\,\sqrt{x} \end{align*}$ as this will be the ending point of our region of integration. $\displaystyle...
  38. P

    MHB Divanshu's question via email about a volume by revolution

    Here is a graph of the region to be rotated. Notice that it is being rotated around the same line that is the lower boundary. The volume will be exactly the same if everything is moved down by 4 units, with the advantage of being rotated around the x-axis. So using the rule for finding the...
  39. P

    MHB Jesse's question via email about volume by revolution

    Here is a sketch of the region to be rotated and the line to be rotated around. Notice that the volume will be exactly the same if we were to move everything up by 3 units, but with the advantage of rotating around the x axis. So we want to find the volume of the region under $\displaystyle...
  40. P

    MHB Nour's question via email about volume of revolution using cylindrical shells.

    Here is a sketch of the region to be rotated. To find a volume using cylindrical shells, you first need to picture what the region would like like when that area is rotated around the y axis. Then consider how it would look if that solid was made up of very thin cylinders. Each cylinder has...
  41. P

    MHB Kivindu's question via email about volume by revolution

    Here is a sketch of the region R and the line to be rotated around. Clearly the x-intercept of $\displaystyle \begin{align*} y = 3 - 3\,\sqrt{x} \end{align*}$ is (1, 0) so the terminals of the integral will be $\displaystyle \begin{align*} 0 \leq x \leq 1 \end{align*}$. We should note that...
  42. P

    MHB Kishan's question via email about volume by revolution

    We should first find the $\displaystyle \begin{align*} x \end{align*}$ intercept of the function $\displaystyle \begin{align*} y = 2 - 5\,\sqrt{x} \end{align*}$, as this will be the end of our region of integration. $\displaystyle \begin{align*} 0 &= 2 - 5\,\sqrt{x} \\ 5\,\sqrt{x} &= 2 \\...
  43. M

    Rotational Volume Using Shell Method

    Homework Statement Use the shell method to set up and evaluate the integral that gives the volume of the solid generated by revolving the plane region about the y-axis. y = 4 - x2 y = 0 Homework EquationsThe Attempt at a Solution Okay I understand that the region is symmetric about the y-axis...
  44. K

    Maintaining a constant volume of water in a tank

    I have water draining from a tank A into a tank B through a hole (or short pipe) and then being pumped back from B to A. If I know the rate of the pump (say 19 liters per minute), what should the diameter of the hole be so that the volume of tank A remains the same? The actual volume of A is...
  45. S

    MHB Volume of Region Between y=x and y=-x²+2x

    The region between y = x & y = -x² + 2x revolves around y = x. Determine the volume.
  46. Kirito123

    Finding height and volume of a cylinder

    Homework Statement Homework Equations Volume for cylinder = Pi (r)2 h Optimise : 1. make the best or most effective use of (a situation, opportunity, or resource). 2. rearrange or rewrite (data, software, etc.) to improve efficiency of retrieval or processing. The Attempt...
  47. Askhat15

    Finding volume and surface densities of bound charge

    Homework Statement A slab of material has parallel faces. One coincides with the xy plane (z = 0), while the other is given by z = zt . The material has a nonuniform polarization P = P(1 + αz)zˆ where P and α are constants. Fin the volume and surface densities of bound charges[/B] The Attempt...
  48. F

    Volume enclosed by two spheres using spherical coordinates

    Homework Statement Use spherical coordinates to find the volume of the solid enclosed between the spheres $$x^2+y^2+z^2=4$$ and $$x^2+y^2+z^2=4z$$ Homework Equations $$z=\rho cos\phi$$ $$\rho^2=x^2+y^2+z^2$$ $$dxdydz = \rho^2sin\phi d\rho d\phi d\theta$$ The Attempt at a Solution The first...
  49. Tap Banister

    I The universe doesn't have volume from outside?

    A friend and I have been debating a topic for the last few days and I would really like a more informed opinion on the discussion. My friend says that IF you could, some how, see the universe from the outside and it appears that the universe is a finite flat, spherical shape, or other shape...
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