What is effect of pressure on melting ?
Answers
Answer:
Melting it would increase the volume of that substance because liquids take more space than solids. If you increase the pressure, it becomes harder for that transformation to occur. It's harder to change into a state that needs more volume if you are under pressure! So, you need more energy, hence temperature, to melt.
Explanation:
It depends upon whether, when the solid melts, it either expands and so becomes less dense, or it contracts and becomes more dense.
Most solids do the former, such that the solid is more dense than the liquid and therefore sinks within it. But, a few, with ice being the most important example, actually expand on melting, meaning that the solid is less dense than the liquid, and floats.
For the majority, increasing the pressure will increase their melting point, in accordance with LeChatelier’s principle. Since they expand upon melting, an increase in pressure tends to prevent it from melting, therefore raising their melting point. With water, it contracts upon melting, so an increase in pressure is encouraging melting, and so, its melting point decreases.
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