Recent content by Karlos

  1. K

    Speed of sound in steel dependance on temperature

    Hello, Nice easy question for you all today: I would like to know how the speed of sound in steel varies with temperature. A google search didnt reveal a great deal, so if a physicist could confirm the relationship, that would be much appreciated. I know that: v = √shear modulus/density...
  2. K

    Thermal expansion of liquid into gas void

    Thanks to both once again, You've given me some good pointers, Ill go away and re-think the problem and explore the industry experience a little. Cheers!
  3. K

    Thermal expansion of liquid into gas void

    Thank you both for replying. Perhaps I ought to put the problem in context. I work in the oil industry - in a typical oil well, you have a pipe through which the oil flows from the rock deep in the ground, up to surface. Then you have several concentric pipes going outward from this pipe...
  4. K

    Thermal expansion of liquid into gas void

    I have a question about thermal expansion of liquid into a gas void. Imagine a closed upright cylinder filled mostly with water – say 99%, and the remaining 1% is gas. Now imagine that you heat the cylinder and its contents. The water will expand by ΔV owing to thermal expansion. The gas...
  5. K

    Ultrasound Attenuation: Why Power Ratio?

    Thank you for your reply nasu. My question was more about the quantities used to compute the ratio itself. If you are comparing an output voltage to an input voltage for a give value of x (distance) and a given medium you could write: ##10log\frac{P}{P_0} =...
  6. K

    What scientific disciplines are you interested in expanding your knowledge on?

    Hi, I have just joined Physics Forums, I graduated in chemistry in the UK back in 2003, although I am interested in all scientific disciplines and like to expand my knowledge. I work in the oil industry, and frequently have to call upon physics and mathematical knowledge in order to perform...
  7. K

    Ultrasound Attenuation: Why Power Ratio?

    Hello, I have a simple physics question. It is about ultrasound attenuation. Why is the attenuation a function of the log of the POWER ratio? i.e. why must it be the ratio of power quantities rather than field quantities? what is the physical basis of this relationship? thank you!
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