OK I need some help in understanding a very basic phenomena, Please try to help,
ID: 862015 • Letter: O
Question
OK I need some help in understanding a very basic phenomena, Please try to help, any help is appreciaated
I need to understand vapor pressure
I know what vapor pressure is but I do not understand this statement "But at the boiling point, the saturated vapor pressure is equal to atmospheric pressure, bubbles form, and the vaporization becomes a volume phenomena".
Vapor pressure is the pressure of the vapor above the liquid yes and then there is atmospheric pressure on the liquid as well. The site says that "Ordinary evaporation is a surface phenomenon - since the vapor pressure is low and since the pressure inside the liquid is equal to atmospheric pressure plus the liquid pressure, bubbles of water vapor cannot form".
How does the vapor pressure affect the boling point? Why cant the bubbles form due to the vapor pressure being low? . PLEASE EXPLAIN THE ABOVE 2 QUOTES IN DETAIL
Explanation / Answer
Vapor pressure is the pressure of the vapor above the liquid yes and then there is atmospheric pressure on the liquid as well. The site says that "Ordinary evaporation is a surface phenomenon - since the vapor pressure is low and since the pressure inside the liquid is equal to atmospheric pressure plus the liquid pressure, bubbles of water vapor cannot form".
answer-think like that water layer has some mass so Mg(weight) will act downward,as u go down the no of liquid layer increases hence it will need more energy ,hence more pressure, hence it will not allow the bubble formation inside the liquid but upper layer molecule gets evaporated easily.
but in case of saturated vapour pressure incoming molecules strikes the surface with some force hence molecule at down the bottle also get some energy and able to form bubbles..I HOPE NOW U BECOME CLEAR ,any ques please ask
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