CHE 131 Chapter Notes - Chapter 5: Barometer, Dioscorea Alata, Torr

• School: Stony Brook University
• Department: Chemistry
• Course: CHE 131
• Professor: Troy Wolfskill

Document Summary

Gas particles move randomly in a container w high velocities, colliding frequently w the container"s walls. The force of the collisions with the walls is the pressure of the gas. The gasses in the atmosphere exert a force on all objects, which is called atmospheric pressure, and = 14. 7 lbs per square inch of surface: measuring gas pressure: barometers and manometers. Barometer- used to measure atmospheric pressure more mercury. Tube 1 m long, closed at one end filled w mercury and inverted into a dish w. When the tube is inverted, some of the mercury flows into the dish, and a. The column of mercury exerts the same pressure on the mercury surface in the. Diameter of the ube doesn"t matter bc ratio of pressure to area is the same vacuum forms above the mercury remaining in the tube dish as the atmosphere does. Pressure is directly proportional to height so unit is mmhg.