This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Lecture #42 Gas Pressure A. Pressure 1. The force per unit area on a surface, pressure =force/ area 2. Gas molecules exert force, and therefore pressure, on any surface with which they collide B. Units of Pressure Unit Symbol Definition / Relationship Pascal Pa Si Unit 1 Pa = 1 N / m 3 Millimeter of mercury Mm Hg Atmosphere atm Average atmospheric pressure at sea level and 0 C Torr torr 1 torr = 1 mm Hg C. Equivalency statement 1. 1 atm = 760 mm Hg = 760 torr = 101.3 kPa D. Instrument: Barometer Lecture #42 Factors Affecting Gas Pressure A. Amount of Gas 1. molecules = collisions with walls = pressure 2. molecules = collisions with walls = pressure B. Volume 1. volume = surface area = collisions per unit of area = pressure 2. volume = surface area = collisions per unit of area = pressure C. Temperature 1. temperature = molecule speed = frequent (and harder) collisions = pressure 2. temperature = molecule speed = frequent (and softer) collisions = pressure2....
View Full Document