Explain the process of change in state of matter by heating or cooling it.

What are freezing and freezing point ?

A metallic ball and highly stretched spring are made of the same material and have the same mass. They are heated so that they melt, the latent heat required

If water at $0\,^oC$ kept in a container with an open mouth, is placed in a large evacuated chamber,

A metal rod $\mathrm{AB}$ of length $10 x$ has its one end $\mathrm{A}$ in ice at $0^{\circ} \mathrm{C}$ and the other end $\mathrm{B}$ in water at $100^{\circ} \mathrm{C}$. If a point $\mathrm{P}$ on the rod is maintained at $400^{\circ} \mathrm{C}$, then it is found that equal amounts of water and ice evaporate and melt per unit time. The latent heat of evaporation of water is $540 \ \mathrm{cal} / \mathrm{g}$ and latent heat of melting of ice is $80 \ \mathrm{cal} / \mathrm{g}$. If the point $\mathrm{P}$ is at a distance of $\lambda x$ from the ice end $\mathrm{A}$, find the value of $\lambda$.

[Neglect any heat loss to the surrounding.|