Question

A student measured the temperature of a recently melted ice cube at 0oC. After freezing the water back into an ice cube, she found that its temperature was the same. Explain why the temperature remained the same.

Answer 1

Step-by-step explanation:

When ice melts at
`0^(\circ)C`, it requires some energy in the form of heat called the latent heat of fusion.

This is the energy required to melt the ice into the water at
`0^(\circ)C`. This energy changes the state of ice from solid to liquid.

Similarly, the same amount of energy must be extracted to convert water into ice.

Although energy is provided, the temperature is not changing because that energy is used to change the state of water.