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

$1$. Latent heat of fusion: It is the amount of heat energy required to change $1 \ kg$ of a substance from solid state to liquid state at its melting point without any change in temperature.
$2$. Latent heat of vaporization: It is the amount of heat energy required to change $1 \ kg$ of a substance from liquid state to gaseous state at its boiling point without any change in temperature.
$3$. For water:
- Latent heat of fusion $(L_f)$ = $3.34 \times 10^5 \ J/kg$ (or $80 \ cal/g$).
- Latent heat of vaporization $(L_v)$ = $2.26 \times 10^6 \ J/kg$ (or $540 \ cal/g$).