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animalcroc
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Why is the triple point of water .01C while the freezing point 0C? It seems contradictory.
cesiumfrog said:The opposite would be more surprising to me. Why does it feel contradictory to you?
The triple point of water is not at atmospheric pressure.animalcroc said:Liquid water at atmospheric pressure cannot become ice until it cools to 0 C, by the definition of freezing point. So, how can ice exist at the Triple Point (above 0 C) since it has not yet reached 0 C ?
animalcroc said:Liquid water at atmospheric pressure cannot become ice until it cools to 0 C, by the definition of freezing point. So, how can ice exist at the Triple Point (above 0 C) since it has not yet reached 0 C ?
You'd have to be really naive! You'd be wrong if you made this kind of guess with most any other liquid.cesiumfrog said:Since water normally boils at 100C, shouldn't you naively expect (based on your above argument) that the triple point (where steam and ice coexist) must be somewhere between 0C and 100C, rather than at either extreme.
Claude Bile said:The triple point of water is not at atmospheric pressure.
Claude.
The triple point of water is the temperature and pressure at which all three phases of water (solid, liquid, and gas) coexist in equilibrium.
The triple point of water is determined by measuring the temperature and pressure at which the solid, liquid, and gas phases of water are in equilibrium. This can be achieved by using a device called a triple point cell.
The triple point of water is higher than the freezing point because it is the temperature at which all three phases of water coexist in equilibrium. This requires a specific combination of temperature and pressure, which is higher than the standard freezing point of water at 0°C and 1 atmosphere of pressure.
The triple point of water is affected by pressure, which can change the temperature at which water transitions between its phases. It is also affected by impurities in the water, which can shift the triple point to a slightly higher or lower temperature.
The triple point of water is important for a variety of scientific and practical reasons. It is used as a reference point for temperature and pressure measurements, and it is also crucial for understanding phase transitions and the properties of water. It also has practical applications in industries such as food preservation and climate control.