Here's why it's called dry ice and how it differs from ordinary ice:

* Dry ice is solid carbon dioxide. Ordinary ice is frozen water (H2O).

* Dry ice sublimates. When dry ice warms up, it skips the liquid phase and transitions directly from solid to gas. This is why it appears to "disappear" rather than melt like regular ice.

* Dry ice is much colder than regular ice. Dry ice has a temperature of about -109.3°F (-78.5°C), compared to 32°F (0°C) for regular ice.

* Dry ice is denser than regular ice. Dry ice is about 1.5 times denser than regular ice.

In summary: Dry ice and regular ice are very different substances with different chemical compositions, physical properties, and behaviors. While both are solids at room temperature, they are very different in their characteristics.