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Why a liquid boils at a lower tempetatur...

Why a liquid boils at a lower tempetature at the top of a mountain than at sea level ?

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This is because pressure at the top of a mountain is low.
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MODERN PUBLICATION-STATES OF MATTER : GASES AND LIQUIDS-Conceptual Questions (2)
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  16. Why a liquid boils at a lower tempetature at the top of a mountain tha...

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  18. The SI unit of the coefficent of viscosity is

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