Vapor Pressure - Vapor Pressure Suppose we have a closed...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Vapor Pressure Suppose we have a closed container into which we pour some water. As soon as we add the water we check a pressure gauge connected to the container. We let the container sit for a while and then we check the pressure again. What might the pressure guage indicate? As the water evaporates the pressure exerted by the vapor above the liquid increases, until at some point, the pressure reaches a constant value , the vapor pressure of the substance: The molecular basis of vapor pressure The kinetic energy of the molecules at the surface of a liquid varies over a range of values:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Some of the molecules have enough kinetic energy to overcome the attractive forces between the molecules The weaker the attractive forces, the greater the fraction of molecules with enough kinetic energy to escape The greater the fraction of molecules which can escape the liquid, the greater the vapor pressure
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 3

Vapor Pressure - Vapor Pressure Suppose we have a closed...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online