What is sublimation and what are some examples of sublimation?

Sublimation is the change in state of a substance from solid directly to gas without passing through the liquid phase.

Carbon dioxide undergoes sublimation at normal atmospheric pressure. It's called "dry ice" because no liquid is produced as the solid transforms to gas. 

Sublimation occurs at a temperature and pressure below a substance's triple point on a phase diagram. The phase diagram below is that of carbon dioxide. The three line segments are points of...

Sublimation is the change in state of a substance from solid directly to gas without passing through the liquid phase.

Carbon dioxide undergoes sublimation at normal atmospheric pressure. It's called "dry ice" because no liquid is produced as the solid transforms to gas. 

Sublimation occurs at a temperature and pressure below a substance's triple point on a phase diagram. The phase diagram below is that of carbon dioxide. The three line segments are points of equilibrium between solid and liquid, liquid and gas, and solid and gas. The triple point, where the three come together, is the point at which solid, liquid and gas exist in equilibrium. Carbon dioxide has a triple point that's much higher than normal atmospheric pressure. Below about 5 atm it transitions from solid to gas at combinations of temperature and pressure that fall on the solid-gas equilibrium line, which is the lower line segment.

Iodine is another example of a substance that undergoes sublimation. It's a silver-gray solid that gives off a purple gas. Water can undergo sublimation under some atmospheric conditions. For example, snow produces water vapor without melting when the air is very cold and dry.