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Specific latent heat

The specific latent heat ($$\ell$$) of a substance is the thermal energy absorbed or released when $$1 \text{ kg}$$ of a substance changes state at constant temperature.

The specific latent heat is given by:$$$\Torange{\text{specific latent heat}}=\frac{\Tred{\text{thermal energy}}}{\Tblue{\text{mass}}} = \frac{\Tred{Q}}{\Tblue{m}}$$$

The SI unit of specific latent heat is joules per kilogram ($$\text{J} / \text{kg}$$).

$$\Tblue{0.2 \text{kg}}$$ of ice absorbs $$\Tred{60\,000 \text{J}}$$ as it melts into water.

The specific latent heat is $$\dfrac{\Tred{60\,000 \text{J}}}{\Tblue{0.2 \text{ kg}}} = \Torange{300\, 000} \text{ J}/\text{kg}.$$

Latent heat is absorbed by ice when it melts into water
Latent heat is absorbed by ice when it melts into water