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Basic Chemistry Chapter 11 Gases Chapter 11 Lecture 11.2 Gas Pressure

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Presentation on theme: "Basic Chemistry Chapter 11 Gases Chapter 11 Lecture 11.2 Gas Pressure"— Presentation transcript:

1 Basic Chemistry Chapter 11 Gases Chapter 11 Lecture 11.2 Gas Pressure
Fourth Edition Chapter Gases 11.2 Gas Pressure Learning Goal Describe the units of measurement used for pressure, and change from one unit to another.

2 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.

3 Atmospheric Pressure Atmospheric pressure can be measured using a barometer.

4 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 = × 105 Pa = kPa

5 Measuring Gas Pressure, Units

6 Altitude and Atmospheric Pressure
Atmospheric pressure changes with altitude and weather. Location Altitude (km) Atmospheric Pressure (mmHg) Sea Level 0.00 760 Los Angeles 0.09 752 Mount Whitney 4.50 440 The atmospheric pressure decreases as the altitude increases.

7 Learning Check What is 475 mmHg expressed in atm? A. 475 atm B atm C × 105 atm

8 Solution What is 475 mmHg expressed in atm? 0.625 atm

9 Learning Check The pressure in a tire is 2.00 atm. What is this pressure in mmHg? A mmHg B mmHg C mmHg

10 Solution The pressure in a tire is 2.00 atm. What is this pressure in mmHg? 1520 mmHg


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