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If there is high pressure, the sample is physically prevented from easily making the phase change at a constant temperature.

PV= nRT

solid --> liquid --> gas

S-->L at high pressure decreases the mp

L -->G at high pressure increases the bp and the temp at vaporization

Analogous to glaciers melting, ice under high pressure will melt.

Analogous to boiling an egg in Boston (sea level) or in Denver (1 mile above sea level). Which takes longer?

Boston, b/c the the pressure at sea level is greater, so the bp is higher. In Denver, there is less vapor pressure (ie, the air above the pot with the egg), so the temp of boiling is lower.

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