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Physical Characteristics of Gases

Physical Characteristics of Gases. Pressure. Objectives. Define pressure and relate it to force Describe how pressure is measured. Convert units of pressure. State the standard conditions of temperature and pressure. Pressure. To adequately describe a gas, you must know… Volume

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Physical Characteristics of Gases

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  1. Physical Characteristics of Gases Pressure

  2. Objectives • Define pressure and relate it to force • Describe how pressure is measured. • Convert units of pressure. • State the standard conditions of temperature and pressure.

  3. Pressure To adequately describe a gas, you must know… • Volume • Temperature • Number of particles • Pressure

  4. Atmospheric Pressure The gases that make up the atmosphere exert pressure on their surroundings. It is a result of: • Collisions between gas particles. • The weight of the atmospheric gases above the earth’s surface.

  5. Measuring Pressure • Atmospheric pressure is measured using a barometer. • Atmospheric pressure depends on elevation and weather. • Normal atmospheric pressure at sea level: 760 mm Hg

  6. Measuring Pressure • A manometer can be used to measure the pressure of an enclosed gas. • The pressure is measured relative to atmospheric pressure.

  7. Units of Pressure • The Pascal is the SI unit

  8. Pressure Conversions • Convert 35 psi into units of atmospheres.

  9. Standard Temperature and Pressure • Conditions used by scientists for comparison. 1 atm 0oC

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