what is vapour pressure ? how can water boil at room temperature ?
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Boiling occurs when the vapor pressure reaches or exceeds the surrounding pressure from the atmosphere or whatever else is in contact with the liquid. At standard atmospheric pressure (1 atmosphere = 0.101325 MPa), water boils at approximately 100 degrees Celsius.
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VAPOUR PRESSURE IS PRESSURE WHICH EXERTED BY VAPOUR AT THE SURFACE OF ANY LIQUID OR FLUID WITH WHICH IT IS IN EQUILIBRIUM.
If the pressure is quickly reduced, the 221°F (105°C) water at normal pressure will nowboil. For another example, put water at room temperature into a vacuum chamber and begin removing the air. Eventually, the boiling temperature will fall below the water temperature and boiling will begin without heating.
If the pressure is quickly reduced, the 221°F (105°C) water at normal pressure will nowboil. For another example, put water at room temperature into a vacuum chamber and begin removing the air. Eventually, the boiling temperature will fall below the water temperature and boiling will begin without heating.
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