Monday, September 6, 2010

Using a straw to pull liquid up?





Hi P3 Joy pupils, do the simple experiment and answer the following questions:

1. When you drink liquid from a cup using a straw, are you really pulling the liquid up?
2. Explain why the liquid can travel up the straw and reach your mouth?(hint: related to air and pressure)
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14 comments:

  1. AnonymousSeptember 7, 2010 at 3:56 AM

    1.Yes
    2.When you are sucking the liquid, the air is pulling the liquid up.

    ReplyDelete
  2. ShermaneSeptember 7, 2010 at 5:35 AM

    1.Yes.

    2.When you suck the liquid,the air can pull the liquid up.

    ReplyDelete
  3. UnknownSeptember 7, 2010 at 9:09 PM

    1.Yes

    2.When I drink water using a straw,it is the air and pressure that pulls the water up.

    ReplyDelete
  4. AnonymousSeptember 8, 2010 at 4:50 AM

    1.No, the liquid is occupying the spaces of the air inside the straw.
    2. The air pressure inside the straw will be lowered when I suck the liquid upwards but the surrounding pressure remains the same, which is higher than inside the straw. This will push the liquid upwards.

    ReplyDelete
  5. jiahuiSeptember 9, 2010 at 7:13 AM

    yes.the air is pulling the luquid up

    ReplyDelete
  6. AnonymousSeptember 9, 2010 at 10:50 PM

    1.No
    2.Air can be compressed. So when we suck the straw, the pressure causes the air in the straw to be compressed and allows the liquid to occupy the space in the straw and travel upwards.

    ReplyDelete
  7. Yoon Shwe YeeSeptember 10, 2010 at 3:27 AM

    1.Yes
    When I in the straw, the air pulls the
    liquid up.

    ReplyDelete
  8. belleSeptember 10, 2010 at 8:37 PM

    Yes.
    It can travel up because you sucked it and air is pulling thing liquid up

    ReplyDelete
  9. UnknownSeptember 11, 2010 at 12:04 AM

    Yes.
    When you drink from a straw,you are sucking up the liquid up using air.

    ReplyDelete
  10. UnknownSeptember 12, 2010 at 1:17 AM

    This comment has been removed by the author.

    ReplyDelete
  11. UnknownSeptember 12, 2010 at 1:21 AM

    1.No
    2.When you suck the liquid ,the air pressure inside the straw is lowered causing the liquid to go upwards.

    ReplyDelete
  12. PhoebeSeptember 12, 2010 at 2:06 AM

    Yes

    ReplyDelete
  13. Pei SwhenSeptember 12, 2010 at 5:14 AM

    Yes
    When you suck the liquid the air inside the straw is loweered causing the liquid to go up.

    ReplyDelete
  14. UnknownSeptember 12, 2010 at 6:50 AM

    When you suck the straw it creates a vacuum,water rushes into the straw to fill the vacuum.

    ReplyDelete

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