https://padlet.com/anniepellegrini/jpfwu0xbkde2 Annie Pellegrini en-us 2017-04-05 16:20:51 UTC 2024-05-15 22:16:19 UTC hello@padlet.com anniepellegrini https://padlet.com/anniepellegrini/jpfwu0xbkde2/wish/166282778 Vapor Pressure:
A measure of the force exerted by a gas above a liquid. 

]]> 2017-04-13 16:22:12 UTC https://padlet.com/anniepellegrini/jpfwu0xbkde2/wish/166282778 anniepellegrini https://padlet.com/anniepellegrini/jpfwu0xbkde2/wish/166283407 When a partially filled container of liquid is sealed, some of the particles at the surface of the liquid vaporize. These particles will then collide with the walls of the container, which causes pressure. The measure of this force is called vapor pressure. Over time, the number of particles that are vaporized increase, and some of these particles condense and return to liquid.  Eventually, the number of particles condensing will be the same as the number of particles vaporizing. This will cause the vapor pressure to remain constant. In a system at constant vapor pressure, a dynamic equilibrium exists between the vapor and the liquid. The system is in equilibrium because the rate of evaporation of liquid equals the rate of condensation of vapor. At equilibrium, the particles in the system will continue to evaporate and condense, but there is not a change in the number of particles. An example of a closed system at equilibrium is a sealed terrarium. The inner walls collect moisture as a sign that the equilibrium has been established. Particles that were once evaporated are condensing, but other particles are evaporating to take the empty places. ]]> 2017-04-13 16:25:15 UTC https://padlet.com/anniepellegrini/jpfwu0xbkde2/wish/166283407 anniepellegrini https://padlet.com/anniepellegrini/jpfwu0xbkde2/wish/166283819 An increase of temperature in a contained liquid will increase the vapor pressure. This happens because the warm liquid will increase the kinetic energy of the particles. This causes more of the particles to reach the minimum kinetic energy that is necessary to escape the surface of the liquid. The particles escape the liquid and hit the walls of the container with a much higher frequency. The pressure of the vapor can be determined with a device called a manometer. One end of a U-shaped glass tube containing mercury is attached to a closed container. The other end is open to the atmosphere. When there is only air in the container, the pressure is the same on both sides of the rube and so is the mercury level. When liquid is added, the pressure in the container increases because of the vapor pressure of the liquid. The pressure pushes the mercury down on the container side of the tube. The levels of mercury are no longer equal, so you can measure the pressure by finding the difference between the two levels of mercury. As the pressure increases, so does the difference between the two levels]]> 2017-04-13 16:26:57 UTC https://padlet.com/anniepellegrini/jpfwu0xbkde2/wish/166283819 anniepellegrini https://padlet.com/anniepellegrini/jpfwu0xbkde2/wish/166286188 2017-04-13 16:40:40 UTC https://padlet.com/anniepellegrini/jpfwu0xbkde2/wish/166286188 anniepellegrini https://padlet.com/anniepellegrini/jpfwu0xbkde2/wish/166286766 https://youtu.be/JbqtqCunYzAhttps://youtu.be/JbqtqCunYzA]]> 2017-04-13 16:44:00 UTC https://padlet.com/anniepellegrini/jpfwu0xbkde2/wish/166286766