Chapter 1

Chapter 11 Lecture Basic Chemistry Fourth Edition Chapter 11 Gases 11.2 Gas Pressure Learning Goal Describe the units of

measurement used for pressure, and change from one unit to another. 2014 Pearson Education, Inc. Gas Pressure When billions of gas particles collide with the walls of a container, they exert pressure, which is defined as force acting on a certain area. 2014 Pearson Education, Inc.

Atmospheric Pressure Atmospheric pressure can be measured using a barometer. 2014 Pearson Education, Inc. Measuring Gas Pressure, Units One atmosphere (atm) is defined as exactly 760 mmHg.

1 atm = 760 mmHg = 760 torr (exact) 1 mmHg = 1 torr (exact) In SI units, pressure is measured in pascals (Pa); 1 atm = 1.01325 105 Pa = 101.325 kPa 2014 Pearson Education, Inc. Measuring Gas Pressure, Units 2014 Pearson Education, Inc.

Altitude and Atmospheric Pressure Atmospheric pressure changes with altitude and weather. Location Altitude Atmospheric (km) Pressure (mmHg) Sea Level 0.00

760 Los Angeles 0.09 752 Mount

Whitney 4.50 440 2014 Pearson Education, Inc. The atmospheric pressure decreases as the altitude increases.

Learning Check What is 475 mmHg expressed in atm? A. 475 atm B. 0.625 atm C. 3.61 105 atm 2014 Pearson Education, Inc. Solution What is 475 mmHg expressed in atm?

B.0.625 atm 2014 Pearson Education, Inc. Learning Check The pressure in a tire is 2.00 atm. What is this pressure in mmHg? A. 2.00 mmHg B. 1520 mmHg C. 22 300 mmHg

2014 Pearson Education, Inc. Solution The pressure in a tire is 2.00 atm. What is this pressure in mmHg? B.1520 mmHg 2014 Pearson Education, Inc.

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