Question

Give reason - i) latent heat can't be mesured . ii)Pressure has no effect on solid and liquid during phase change.


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Answer 1

1. The temperature of the material during the phase change does not change and hence it is in thermal equilibrium with anything it is in contact with, like a thermometer. Thus a thermometer cannot measure any temperature change when heat is supplied during phase change, otherwise known as latent heat.
2. Note that, at a fixed temperature, you can change the phase from solid (ice) to liquid (water) by increasing the pressure. ... At sufficiently low pressures there is no liquid phase, but the substance can exist as either gas or solid. For water, there is no liquid phase at pressures below 0.00600 atm.

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