why does liquid nitrogen freezes water
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Liquid nitrogen is very cold and on contact with water (presumably at room temperature) there is going to be a great burst of activity as the warmth of the water will cause the cold nitrogen to boil. Nitrogen's boiling point is —320 degrees Fahrenheit.
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The LN would break up into droplets that would float on a layer of rapidly evaporating LN. Each droplet behaves like an erratic and rapidly-moving micro-hovercraft with the insulating effect of the vaporising LN preventing contact with the water, which makes this method of chilling water highly inefficient and wasteful of the energy required to
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