Fire is extinguished more effectively by

The graph shown in the figure represents the change in the temperature of $5 \, kg$ of a substance as it absorbs heat at a constant rate of $42 \, kJ \, min^{-1}$. The latent heat of vaporization of the substance is ......... $kJ \, kg^{-1}$.

The graph shows the variation of temperature $(T)$ of one kilogram of a material with the heat $(H)$ supplied to it. At $O$,the substance is in the solid state. From the graph,we can conclude that

Steam at $100\,^{\circ}C$ is more dangerous than the same mass of water at $100\,^{\circ}C$ because the steam

What is the process of changing the state of matter called?

What is latent heat of fusion? What is latent heat of vaporization? Give its value for water.