Chemistry Notes Unit 7: Intro to Pressure

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Presentation transcript:

Chemistry Notes Unit 7: Intro to Pressure

(1) What is Pressure? The force exerted in a given area. Force for every unit of area.

(2) What are the units for Pressure? “psi” = lbs / in2 Lbs = pounds (force) in2 = inches squared (area) “pascal” or “atm” = N / m2 N = newtons (force) m2 = meters squared (area)

(3) Pressure Units Example #1 Using the following relationships… 1 atm = 760 mm Hg 1 atm = 14.4 psi 1 atm = 101.3 kPa (kilopascal) ______________________________ Convert use factor labeling to convert 320 mmHg to atm.

(4) Pressure Units Example #2 Using the following relationships… 1 atm = 760 mm Hg 1 atm = 14.4 psi 1 atm = 101.3 kPa (kilopascal) ______________________________ Use factor labeling to convert 30.0 psi to mmHg.

(5) Factors Effecting Pressure Volume (V) Number of Particles (n) Temperature (T)

(6) Pressure Relationships Linear Relationship: Both increase, OR, Both decrease As the “factor” increases…. So does pressure Equation  division (fraction) Inverse Relationship: One increases, One decreases Pressure decreases Equation  multiplication

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