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I understand that during a phase change in water, two phases may exist at the same time. I heard that there is something called a triple point, in which all three phases of water could co-exist at the same time but I can't seem to wrap my head around it. Please explain!
So the triple point is at around 0.01 degrees Celsius and 611.657 Pascals and this is the lowest pressure at which liquid water can exist. At this temperature and pressure, all three phases coexist in thermodynamic equilibrium. Any slight change in pressure can make the water change its state.
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