Difficult
What are fusion and melting point? On what does the value of melting point depend?
(N/A) Fusion is the process of phase transition in which a substance changes from a solid state to a liquid state by the absorption of heat at a constant temperature.
The melting point is the specific temperature at which a solid substance changes into its liquid state at a given pressure.
The value of the melting point depends on the following factors:
$1$. Nature of the substance: Different materials have different intermolecular forces,leading to different melting points.
$2$. External pressure: For most substances,an increase in pressure increases the melting point. However,for substances that contract upon melting (like ice),an increase in pressure decreases the melting point.
The melting point is the specific temperature at which a solid substance changes into its liquid state at a given pressure.
The value of the melting point depends on the following factors:
$1$. Nature of the substance: Different materials have different intermolecular forces,leading to different melting points.
$2$. External pressure: For most substances,an increase in pressure increases the melting point. However,for substances that contract upon melting (like ice),an increase in pressure decreases the melting point.
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Similar Questions
Match the following items in Column-$I$ with their corresponding definitions in Column-$II$.
Column-$I$ Column-$II$ $A$. Conversion of liquid into solid is $1$. Regelation $B$. Conversion of liquid into vapour is $2$. Sublimation $C$. Conversion of solid into vapour directly is $3$. Fusion $D$. Melting of ice caused by pressure is $4$. Vaporisation
| Column-$I$ | Column-$II$ |
| $A$. Conversion of liquid into solid is | $1$. Regelation |
| $B$. Conversion of liquid into vapour is | $2$. Sublimation |
| $C$. Conversion of solid into vapour directly is | $3$. Fusion |
| $D$. Melting of ice caused by pressure is | $4$. Vaporisation |
Match the following according to conversion by heat:
Column-$I$ Column-$II$ $(a)$ Required heat to convert solid into gaseous. $(i)$ Latent heat of fusion $(b)$ Required heat to convert solid into liquid. $(ii)$ Latent heat of vaporization
| Column-$I$ | Column-$II$ |
|---|---|
| $(a)$ Required heat to convert solid into gaseous. | $(i)$ Latent heat of fusion |
| $(b)$ Required heat to convert solid into liquid. | $(ii)$ Latent heat of vaporization |
Easy
View SolutionTwo substances $A$ and $B$ of equal mass are heated at a constant rate of $6 \ cal \ s^{-1}$. The graph shows the temperature versus time. What is the ratio of the heat absorbed for complete melting $H_A/H_B$?
Difficult
View SolutionAn experiment takes $10\, minutes$ to raise the temperature of water in a container from $0\,^oC$ to $100\,^oC$ and another $55\, minutes$ to convert it totally into steam by a heater supplying heat at a uniform rate. Neglecting the specific heat of the container and taking the specific heat of water to be $1\, cal/g\,^oC$,the heat of vaporization according to this experiment will be ........ $cal/g$.
$A$ block of ice at $-10^{\circ}C$ is slowly heated and converted to steam at $100^{\circ}C$. Which of the following curves represents the phenomenon qualitatively?
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