SME
Grade 10 Science · Problem type
What moves the boiling point?
Use this for “Why does an egg take longer to cook in boiling water high on a mountain?”
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Does the change raise or lower the temperature the water boils at?
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Assumptions
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Water boils when its vapor pressure matches the air pressure pushing on it.
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Less air pressure: it boils sooner, at a lower temperature. More pressure: later, hotter.
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A dissolved solute lowers the vapor pressure, so the water must get hotter before it boils.
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