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Originally Posted by aznhiphopkids and second i need to find out how paper is able turn in to smoke with out turning in to liquid first.. becuz i learned that solid must passed the melting point to turn to liquid and vaporate to gases from that phase.. |
No, a solid melting and then the liquid vaporizing into a gas is the common series, but it is not a required series. There is a process called sublimation in which a solid goes directly into a gaseous state, bypassing liquid (the opposite - a gas solidifying directly without going through a liquid state is called deposition).
One common example of sublimation is moth balls: they are a solid that slowly convert into a gas without ever going through a liquid state. Dry ice is another commonly mentioned example. Even the water ice in your freezer will undergo sublimation: if you make ice and then leave the ice trays alone for several weeks, then examine them, you will see that the ice has shrunk: the ice didn't turn into liquid, but straight into a gas.
If you look at a typical phase diagram, which shows the states of matter for a particular substance at different combinations of temperature and pressure, you will that at the lowest pressures a horizontal line can be drawn from the solid state to the gaseous state without having to pass through a liquid state, thus indicating that a phase transition can occur from a solid to a gas directly.
turn paper into smoke? what do you mean? 
