Melting and freezing show us how energy is conserved by moving heat around.

1. Melting:

   • When a solid like ice melts, it takes in energy from the things around it.
   • Ice needs about 334 joules of energy for every gram to melt.
   • This energy helps break the bonds between the molecules, but the temperature stays the same.

2. Freezing:

   • On the other hand, when a liquid like water freezes, it lets out the same amount of energy, about 334 joules for each gram.
   • This energy is released at a steady temperature. This shows that a change in state is happening.

3. Energy Conservation:

   • When energy is absorbed or released during melting or freezing, it shows us that energy is still around.
   • Energy doesn’t disappear; it just changes forms.

These processes help us understand that heat energy is really important when matter changes state. They also remind us that energy is always conserved, just changing from one form to another.