Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Water vapor and wet steam

  1. Apr 12, 2015 #1
    Both water vapor and wet steam contain both contain tiny droplets of water particles(correct me if i'm wrong).Does it mean both water vapor and wet steam are same and one ?
     
  2. jcsd
  3. Apr 12, 2015 #2
    Not necessarily. You have to solve for vapour quality (X) and check what state your fluid is in.

    X=mvapor/mtotal
    Wet steam - generally means that it's not "superheated" - meaning that 0<x<1
     
  4. Apr 13, 2015 #3

    russ_watters

    User Avatar

    Staff: Mentor

    Water vapor is gaseous, it is not just tiny droplets.
     
  5. Apr 13, 2015 #4
    @ russ_watters
    The so is wet steam containing suspended liquid particles in gaseous form.Can you please be more specific ?
     
  6. Apr 13, 2015 #5
    @ ksukhin
    So, you say that vapor doesn't mean particularly wet steam but can refer to all three forms of steam (wet, saturated, super-saturated ) depending on the vapor quality or dryness fraction.
    If so then if vapor exists in saturated and supersaturated states then they would be transparent (invisible to human eyes).But the standard definition of vapor states that it is visible in white form while steam in transparent in nature
    watch this link
     
  7. Apr 14, 2015 #6

    russ_watters

    User Avatar

    Staff: Mentor

    Suspended liquid particles are liquid particles (as the description says), they are not in gaseous form: what you said is a self-contradiction.

    A gas is when no two molecules are connected to each other. A liquid is when a lot of molecules are stuck together.

    Unfortunately, the Mr. Wizard video is wrong (though correct that the colloquial label is also wrong). http://en.wikipedia.org/wiki/Steam
     
  8. Apr 14, 2015 #7
    @ russ_watters
    So you say that water that evaporates from open or other sources at atmospheric conditions is water vapor(invisible to human eyes) and as they move upwards they condense to form clouds, containing suspended liquid droplets and is called wet steam.
    If water vapor at atmospheric pressure and below saturation temperature (or at saturation temperature and lower pressure) contains suspended liquid droplets it is known as wet steam and if it doesn't contain liquid droplets and only plain gas then it is called water vapor.
     
  9. Apr 14, 2015 #8

    russ_watters

    User Avatar

    Staff: Mentor

    Yes.
    That's not a stable situation because water vapor can't exist at atomspheric pressure and below saturation (boiling) temperature, but yes, some of it condenses into wet steam...which then also evaporates as it disperses.
    Yes, plain gaseous water is water vapor or dry steam.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook