Yes, carbon dioxide can change directly from the solid phase (dry ice) to the gas phase. This process is called sublimation.

Here's why:

* Sublimation is a phase transition where a substance goes directly from solid to gas without passing through the liquid phase.

* Dry ice is solid carbon dioxide (CO2).

* At atmospheric pressure, dry ice sublimates at -78.5 °C (-109.3 °F).

This is why you see dry ice "disappear" - it's actually turning directly into gaseous carbon dioxide, which is colorless and odorless.