What physically causes bubbles to form when vapor pressure equals atmospheric pressure?

[sashankhrao]

I am trying to understand the concept of boiling from a very fundamental perspective. Most textbooks say that: as a liquid is heated, it's vapor pressure increases. When the vapor pressure reaches the surrounding pressure(or atmospheric pressure at that point), then boiling occurs.

I agree with the above point.

My question is: when the vapor pressure reaches the surrounding pressure, what physically happens that allows vapor to form all through the liquid for it to boil.

Thanks

 

[LostConjugate]

The pressure from inside the water is not much more than 1 atmosphere either. Seems reasonable to me.