[ygao85]

Other than water, why does increasing the pressure inc the melting point?

Thx

[xiankai]

the melting point of a substance is when the IMF (inter-molecular forces) are not strong enough to hold particles in their fixed positions. since the IMF of any substance is constant and fixed for that substance (chemical bonding), the only way to overcome IMF is to energise the particles, commonly done by heating. however, adding pressure will also exert a force on the particles which transfers kinetic energy to them. hence the particles require less heat energy (as they already have some extra energy) to overcome their IMF and thus melt.

[GCT]

because you are essentially increasing the work required to expand against the atmosphere

[arnyk]

If the atmospheric pressure is increased upon a liquid, the amount of energy required to overcome this force will increase thus increasing the melting point.  For example, water has a boiling point of around 373K at sea level, as you go up in altitude and the air pressure decreases, the boiling point lowers.  It is easier to boil water on top of Mt. Everest than it is down here.

[alphahydroxy]

that's why you can't make a proper cup of tea on top of Mount Everest...