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Who told you that water can not exceed its boiling point? It happens every day! Every day someone heats a cup of water in the microwave. It reaches around 110 C or 230F. Then when they drop a teaspoon full of instant coffee into the cup, it boils all over the place. The superheated water is dropping down to its boiling point. Water can exceed its boiling point.

Water can also exceed its boiling point in an enclosed pressurized container. One such machine was called "The steam locomotive." One item used on the cook stove was called "The Pressure Cooker." These heated water above the boiling point.

However, under standard conditions, when water begins to boil its vapor pressure will equal the air pressure. Any attempt to make the water hotter would increase its vapor pressure. When water gives off vapor, that cools down the temperature of the water. So the air pressure determines boiling point.

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