Scientific reason why does water boils?

Answer 1

When the pressure and temperature substance are right, it will change phases. In the case of water boiling this happens at 100 degrees C, or 212 F, at sea level (I won't get into why it happens at that temperature here). Not all the water reaches this temperature at once, so the molecules that have and that are close enough to the surface break through at the surface as vapor. The reason bubbles form is that the gasses gather at tiny imperfections on the surface of whatever it is being boiled in. This is why very smooth containers cause less bubbles when water is boiled in them.

I hope this helps.

Answer 2

when heat is transferred from the flame to the water, the water molecules gain kinetic energy. The "energetic" molecules nearer to the base of the boiling pot will collide with the less energetic molcules. As times passes by this colliding process will get nearer and nearer to the surface of the water. There will be a time in which the water molecules at the surface will have sufficient energy to overcome the attractive force between neighbouring molecules and escape into the atmosphere as vapour molecules. This process is know as boiling.

Answer 3

It boils when the vapor pressure of the liquid water exceeds the pressure of the water around it. When that happens, it turns to steam (which is what is in all those little bubbles.

Doug