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How can the water be 300 degress? I don't mean that like as in sarcasm, generally how, it's so weird!
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The pressure at the sea bed, which is considerable, keeps it liquid. Pure water only boils at 100 degrees Celsius in the average atmospheric pressure present at sea level. As you climb in altitude the pressure drops and the water is able to boil at lower temperatures. That is why you can't make a good cup of tea up a mountain: the water boils at too cool a temperature so cannot become hot enough to open up the tea leaf cells. Similarly, pressure cookers allow you to boil food at a higher than 100 degrees Celsius by maintaining a high pressure within the cooker.