1. L

    Changes of gas in a vessel with a tap

    "A vessel of volume 2.0*10^-2 m^3 contains an ideal gas at a pressure of 1.50*10^5 Pa. A tap attached to the vessel is opened and the gas expands adiabatically until its pressure equals the atmospheric pressure of 1.01*10^5 Pa. The tap is then closed. The gas is allowed to return to its original...
  2. E

    Constant Volume System

    I keep seeing various variations of this problem in different thermodynamics problem sets: A closed system of constant volume experiences a temperature rise of 25oC when acertain process occurs. The heat transferred in the process is 30kJ. The specific heat at constant volume for the pure...
  3. S

    How can a truly isolated system change its volume?

    A question for thermo experts to think about. How can a truly isolated system change its volume?
  4. P

    Pressure and Volume work

    Hi everyone! This is my first post, so if you have tips on formatting please let me know. I am currently in a graduate level dynamics class and right now we are studying the first law of thermodynamics. The question that is giving me trouble is as follows: One day the atmosphere to...
  5. T

    Hurst exponent in Tick Volume.

    Hello, I am trying to calculate Hurst exponent using as an input FX Tick Volume. However being not educated in advanced math and physics, I struggle to obtain clear and objective results. I am not sure whether I get reliable Hurst exponent calculation. One Tick is each change of price...
  6. B

    Heat loss within a control volume

    Hello, I have the following problem: I got an electrical component within a chamber and the chamber has an opening, where air can be supplied from and an outlet. Attached you can see an illustration of the problem. The electrical component has a heat loss of 150 W The temperature at...
  7. O

    Energy being transferred to a container with air...

    Hello All. I would appreciate any help you can offer on this problem! Air is tightly contained in a closed, well-insulated tank with a volume of 0.5 m3. The tank is fitted with a paddle wheel that transfers energy to the air at a constant rate of 3 W for 1 hour. The initial density of the...
  8. T

    Time for steam to fill a certain volume

    Hi, I'm new to thermodynamics. I am trying to find how long it will take a cavity of 2' x 4' x 4' to reach 211 F with a steamer with an output of 35 g/m @ 211 C. At some point I need to take into account the heat loss through the walls but for now I think I need to just find the time...
  9. R

    Constant volume cooling

    Hello everyone, I solved a question but having no answer sheet I am not completely sure if what I did is correct. Problem: 5 kg of CO2 at its critical state is placed in a perfectly rigid container, which is then cooled until the temperature is 260 K. - What is the volume occupied by liquid...
  10. L

    prism volume

    why the formula of volume is given by integral of P and dA , the integral of P and dA would yield Force , right ?
  11. L

    coefficient of volume expansion of ideal gas

    why the coefficient of volume expansion of ideal gas is given by the formula = 1/T ? by saying it = 1/T , the assume delV / V amd delP / P = constant ? why ? when the temp change , the density and specific volume(v) also change , right ?
  12. L

    volume flow rate

    what is G and γ mean here ?
  13. T

    How volume charge density can be zero?

    We see in the Laplace equation (del^2)V=0 only if volume charge density is zero. But electric field intensity(E) is not equal to zero. What can be the physical situations to satisfy this equation.?
  14. M

    Estimate Volume using ideal gas law

    An ideal gas (H2) filled vessel is a part of a chemical process. The volume of vessel is depending on product status and nobody knows what is the exact volume? I think we can calculate it using ideal gas law and with help of pressure and temperature measurement. It is worth telling a pipe is...
  15. D

    Analyzing a simple piston-pump (energy balance? deforming control volume?)

    I'd like analyze the internals of the simple pump shown in the attachment. It replaces old engine oil with fresh oil simultaneously, pumping the old into a waste tank and pumping the new into the engine via a make-up tank. I think I'd want to create two deformable control volumes, one for...
  16. W

    specific molar volume

    Hi, I am attempting a fluid mechanics problem involving viscosity using eyring equation. Equation as follow: Where, N^ is avogadro constant h is planck's constant, T_b is boiling temperature T is temperature, and V^ is specific molar volume [Bird et al 2012] given: pressure...
  17. T

    Help working out the moving of volume and stone (fictional/theoretical)

    Heya everyone, I am a fan of various fictions and I like to try and find out how "physically" impressive some characters superpowers are. Admittedly being a fiction not all physical processes are likely being followed but it can be interested to try and find out various speeds, forces and how...
  18. C

    Supposedly Simple Volume Problem

    A typical adult human lung contains about 330 million tiny cavities called alveoli. Estimate the average diameter of a single alveolus. Assume the alveoli are spherical and a typical human lung is about 1.9 liters. The answer needs to be in meters. This is what i did: I converted 1.9 L to...
  19. P


    Suppose you have a quantity of water with a volume measurement of 1,535 +/- 10 ml. This quantity of water is to be transferred into a regular orthogonal container whose interior dimensions measure 15.0 +/- 0.1 cm long, 10.0 +/- 0.1 cm wide, and 10.0 +/- 0.1 cm deep. If you attempt to pour the...
  20. U

    [SOLVED] Density, Mass and Volume

    Q) The density of liquid water is 1.0 g cm^-3. The density of water vapour at atmospheric pressure is approximately 1/1600 g cm^-3. Determine the ratio (i) volume of water vapour / volume of equal mass of liquid water (ii) mean separation of molecules in water vapour / mean separation of...