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Problem involving a kettle, water & steam..i've a riveting life.

  • 12-10-2013 12:31am
    #1
    pmk19
    Registered Users, Registered Users 2 Posts: 265 ✭✭


    Hi,

    Looking for help solving a problem involving the ml of water released as stream when a kettle is boiled.

    If a 2 litre kettle is full, how many times could I boil the water till the kettle is empty.

    Hope that makes sense.

    Would greatly appreciate any help.

    thanks


Comments

  • #2
    ifeelill
    Registered Users, Registered Users 2 Posts: 502 ✭✭✭ifeelill


    This might help

    We can also calculate the mass of water that will be turned to steam if a kettle is left boiling (at 100oC) for 5 minutes. Will the kettle boil dry?

    Example problems
    Power of kettle = 2 kW
    Time of boiling = 5 mins = 600s
    Heat energy produced in that time = 2000 x 600 = 1 200 000J
    Heat energy needed to turn 1 kg of water into steam = 2 260 000 J
    Mass of water turned to steam = 1 200 000/2 260 000 = 0.53 kg = 530 g.

    The kettle will usually have more water in it than this at the start and so it should not boil dry. We have assumed that there is no heat lost by the kettle.

    Source: http://www.schoolphysics.co.uk/age14-16/Heat%20energy/Heat%20energy/text/Latent_heat/index.html

    Its also worth nothing that a kettle turns off the power that is boiling the water within the kettle once the water has come to its boiling point, although the example above is a true calculation it would be more repetitive of a pot of water boiling on the hob rather than a kettle


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