Why is there smoke when you put dry ice in water?

Question

Why is there smoke when you put dry ice in water?

Answer 1

Dry ice is actually frozen carbon dioxide, and the "smoke" you see is carbon dioxide becoming a gas.  

When most solids are heated they melt, then with more heat, they become a gas. Carbon dioxide is one of a few special cases that will turn straight from a solid into a gas.  It's called sublimation.   The water (even cold water) is much warmer than the dry ice (which is -78.5 degrees Celsius) so this causes the dry ice to become a gas when you put it in water.

Answer 2

Its not the smoke actually but CO2 that immediately converts into its actual state that is gaseous state and hence forms effervescence as soon as put into the water..