Demonstrating Hidden a Danger Microwave





Introduction: Demonstrating Hidden a Danger Microwave

The heating of water in the microwave can actually be dangerous? Watch the video and see the potential hazzards involved with this everyday activity. Water alone should never be heated in a microwave. Watch and find out why.



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    Would it do the same thing if your microwave had a turntable ?


    It depends how fast you turntable turns and how big the container is.
    Gas will condense out of a saturated liquid if there are points of low pressure. Soundwaves travelling through a liquid do this since sound is just periods of high and low pressure. The low pressure allows gas to condense out easier. If your microwave turntable turns fast enough to cause microscopic eddies around the sides of the container (liquids dont tend to turn as a whole if you turn them, the sides will as they stick to the cup, but the centre wont move much), then it will boil. The centre of eddies are lower pressure than the surrounding fluid, just like tornados.
    BUT, the smaller the cup in the centre of the turntable the less speed the sides are moving at, the less chance of eddies forming due to the different speeds in the liquid. Honestly most microwaves probably don't turn fast enough to have any effect. So.. yes in all likelihood it will happen.

    The inverted plate probably covers the turntable.


    The reason water superheats has little to do with the microwave oven you have, and more the container it is boiled it.
    A ceramic cup, or pyrex glass, when new are near perfectly smooth down to the atomic level. Most water is to all extents "pure", unless you live a a very hard (chalk flakes in the water hard) water area. As a microwave excites the water in the cup as a whole relatively evenly, not like a pan where only the bottom of the pan conducts heat to the water, causing water to "convect" (hot water rising as it becomes less dense, making the water circulate from to top to bottom), the water can receive more energy than it needs to boil into a gas.
    This is because for a bubble to form it needs a point to concentrate on. This can be a pressure wave through the liquid, like that caused when water circulates. You can test this yourself, get 2 bottles of larger and a friend. After opening your friend's larger, tap the lip of the open bottle downwards and watch as the gas in the larger is released by the soundwave travelling through the glass into the larger, and he calls you a dick for covering him in beer.
    Another way gas bubbles form is on scratches and imperfections in the container walls. This is why bubbles form on the inside of open lemonade bottles, a scratch on the bottle wall allows CO2 molecules to condense (long boring explanation why, basically static electricity on a very small scale). Once a bubble forms it causes pressure changes in the surrounding solvent which then allows other bubbles to form.
    In a new cup there are no microscopic scratches yet, and as the water is heated from the centre outwards, no convection currents form. So the still water can superheat. Which then explosively boils the moment you move the cup/put a spoon/milk into it.
    If you have a new powerful microwave and a new cup,put a wooden chopstick in it or stir it first before heating up your tea or coffee.

    "Superheated" water has been an issue in Australia for over 10 years--particularly in high-power ovens (> 2400W) where the water can exceed boiling, but the glass is still cool to the touch.

    Pyrex and glass are the worst offenders. As cited elsewhere porous materials are safer, and water purity plays a major role.

    Drop a sugar cube in it....JUST LIKE MYTHBUSTERS! (they used distilled water btw)

    The water in question is likely distilled water (or water with very very little to no impurities in it) Water boils due to the impurities in it (part of the reason to add salt to a pot of water you want to boil, the other is to raise the boiling point so when you add food it doesn't take as long to get the water and food simmering or boiling again) So it you take distilled water, raise its temperture to the boiling level and then add an impurity( salt, suger, whatever is naturally on the spoon or whatever he added to the bottom of the spoon) you will get a flash boiling which will tend to cause very hot water to splash and shoot out of the container it was heated in.

    I fail to see what conditions you use to cause the water to boil. I'm sure we all know the facts about this, but if you could add them to the Instructable? Just for the record, every day I heat up my large coffee mug of water to make some 'Chai Tea'. The microwave has always been set to three minutes and thirty seconds. (I like the drink extra hot :) ) Not once have I had this issue 'pop up'. :P

    That's because your not using distilled water, it happens if the water is pure or filtered.

    Another fun thing to do is heat soapy water for a couple of minutes.