PHYSICS

JAMB 2011 - Question 18

Physics 2011 JAMB Past Questions - Question 18: The phenomenon that shows that increase in pressure lowers the melting point can be observed in

Choose the correct answers from the options given.
The phenomenon that shows that increase in pressure lowers the melting point can be observed in
A:
B:
C:
D:
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Correct Answer

B

Explanation

The phenomenon you're referring to, where an increase in pressure lowers the melting point of a substance, is known as "pressure-induced melting" or "pressure-induced phase transition." This effect is particularly evident in certain materials, such as ice.

In the case of ice, increasing the pressure can cause it to melt at a lower temperature than it would at standard atmospheric pressure. This is due to the unique properties of water and its ice phases. Normally, when you apply pressure to a substance, you'd expect it to increase its melting point. However, water ice has a structure that is more stable at higher pressures, which means that at higher pressures, it can melt at lower temperatures.

This phenomenon is not limited to ice; it can also occur in other substances with unusual phase diagrams or under specific pressure-temperature conditions. The exact behavior may vary depending on the specific material and its phase diagram.

Keep in mind that pressure-induced melting is a complex phenomenon and is not observed in all materials. It typically occurs in substances with particular molecular or crystal structures that are sensitive to changes in pressure.

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