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# 12.1

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### 12.1

1. 1. Characteristics of Gases 12.1
2. 2. Gases are FLUIDS <ul><li>Fluid not liquid </li></ul><ul><li>Fluid because they can flow. </li></ul>
3. 3. Gases have low density <ul><li>Long distance between particles </li></ul><ul><ul><li>Gas particles have to travel a long distance before they collide with each other. </li></ul></ul>
4. 4. Gases are compressible <ul><li>Gas particles can be moved closer together with PRESSURE. </li></ul><ul><ul><li>Increased pressure = decreased volume </li></ul></ul><ul><ul><li>Decreased pressure = increased volume </li></ul></ul>
5. 5. A gas will completely fill its container. <ul><li>Gas particles are constantly moving. </li></ul><ul><li>Gas particles do not attract each other. </li></ul>
6. 6. Gas Pressure <ul><li>Collisions of gas molecules cause air pressure. </li></ul><ul><li>Atmospheric pressure = the weight of the air above you. </li></ul><ul><ul><li>Higher up = less air above = less pressure </li></ul></ul>
7. 7. Measuring Pressure <ul><li>Pressure = force/area </li></ul><ul><li>SI unit for force = newton (N) </li></ul><ul><li>SI unit for pressure = pascal (Pa) </li></ul><ul><li>Atmospheric pressure is measured with a barometer. </li></ul>
8. 8. STP <ul><li>Standard Temperature and Pressure = 0 0 C and 1 atm. </li></ul>
9. 9. Kinetic-Molecular Theory <ul><li>1. Gas particles are in constant, rapid motion. </li></ul><ul><li>2. Gas particles are far apart. </li></ul><ul><li>3. Gases are fluids. </li></ul><ul><li>4. Gases can be compressed. </li></ul>