Water becomes a gas when it reaches the boiling point, which is 100 C at sea level. The boiling point is different at lower air pressures / higher elevations.
gas
When water evaporates it becomes a gas.
That one is easy. It becomes a gas. That process is called "Vaporation". The steam that comes out of the water is the gas. It only becomes a gas when the water boils.
It depends on what substance you a talking about. Water becomes a gas (boils) at 100oC.
By evaporation water become a gas.
The water becomes a gas.
evaporation
More correctly it becomes a vapor, but a gas is still an acceptable term.
is water vapor
water to water vapor
Becomes a gas (i.e. water vapor)
Depends. Water vapor for example is a gas. When water vapor condenses in the atmosphere, it comes back as precipitation (rain, liquid). When liquid becomes too hot, it evaporates into gas. When gas becomes too hat, it becomes plasma. When liquid becomes too cold, it becomes a solid.