Sunday, December 25, 2011

HOW TO PROVE WATER VAPOUR IS PRESENT IN AIR???

Do you know water vapour is present in the air?? Water vapour is a gaseous form of water. Let's prove that water vapour is present in air?
Materials:
Clean glass tumbler
Dry towel
Ice cube


Instructions


Wipe the outside of the glass with a clean dry towel to ensure it is dry from the outside.


Place a few ice cubes inside the glass and wait for a few minutes.


Observe: You would notice the outside of the glass turns misty and finally droplets of water appear on the outside of the glass


HOW DOES THE WATER COMES OUTSIDE THE GLASS???


This happens because of condensation. Water vapor is present in air and when comes contact with cold objects changes into liquid form

6 comments:

  1. Thank you as this helped me in my homework. Thanks a lot!!!!!!!!

    ReplyDelete
  2. Thanks.........felt helpfull !!!!!!!!

    ReplyDelete
  3. I will tell you guys an experiment better than this one and it's Cool a sheet of metal and leave it in the room, if the air consists water vapor, it will condense on the cold metal.

    Sincerely,
    Menna Loves.

    ReplyDelete
    Replies
    1. Menna, What you said is absolutely right but this would take a lot of time and would require a hot weather for quicker results, hence cannot be shown as a school project, etc.

      Delete
  4. Thanks helped in exam

    ReplyDelete