Caption: "Small pellets of carbon dioxide ice (CO_2 ice AKA dry ice) sublimating (evaporating in loose astro-jargon) in air. The pellets are ∼ 0.5--1.0 cm in size scale." (Slightly edited.)

Features:

1. Carbon dioxide (CO_2) is an everyday life example of a substance without a liquid phase at ordinary pressures (see Wikepdia: standard ambient temperature and pressure (SATP or STP, T=298.15 K=25 C, P=100 kPa=14.504 psi)).

2. In the image, you can just barely descry the CO_2 gas fuming away.

3. Under ordinary Earth surface air pressure, the liquid phase does NOT exist in thermodynamic equilibrium for CO_2.

   CO_2 changes from solid to gas directly by sublimation---the reverse process is deposition.

4. In astro-jargon, we loosely use vaporization (or when appropriate evaporation) for sublimation and condensation for deposition.

5. CO_2 ice is called dry ice because, of course, it isn't wet.

6. The sublimation temperature of dry ice (i.e., the temperature below which it would NOT sublimate) is -78.5°C (194.65 K) under ordinary Earth surface air pressure.