# Properties of Gases 1) All gases have mass. Remember: We normally test gases in relation to “air”

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Properties of Gases 1) All gases have mass. Remember: We normally test gases in relation to “air”

Properties of Gases 2) Gases will always spread to fill their containers completely. [http://wps.prenhall.com/wps/media/objects/476/488316/Ins tructor_Resources/Chapter_11/FG11_07.JPG]

Properties of Gases 3) Gases exert pressure on objects around them. 3) Gases exert pressure on objects around them. [http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter09/Text_Images/FG09_01.JPG] Click Here for a “Can Crushing” Demo

Air is more dense near the surface of the earth, so it exerts more pressure! [http://www.space.gc.ca/asc/img/spacesuit_2_2_3_1_A.jpg] Click Here for Proof of Atmospheric Pressure

http://cwx.prenhall.com/petrucci/medialib/media_portfolio/text_images/TB06_01.JPG

Properties of Gases Sample Conversion: Sample Conversion: If the weather reports atmospheric pressure as 31.5 inches of mercury outside, what is it in atmospheres? If the weather reports atmospheric pressure as 31.5 inches of mercury outside, what is it in atmospheres? 31.5 inHg2.54 cmHg 1 inHg 10 mmHg 1 cmHg 1 atm 760 mmHg = 1.05 atm

Properties of Gases Pressure of the atmosphere is measured using a barometer. Pressure of the atmosphere is measured using a barometer. [http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter09/Text_Images/FG09_03.JPG] Vacuum

Properties of Gases Pressure of “trapped” gases can be measured using a manometer. [http://cwx.prenhall.com/petrucci/medialib/media_portfolio/text_images/FG06_05.JPG]

Properties of Gases 4) It is easy to compress a gas. 4) It is easy to compress a gas. [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_11/FG11_05.JPG]

Properties of Gases 5) Different gases will move through one another in a process called diffusion. 5) Different gases will move through one another in a process called diffusion. This is also affected by the size of other gas particles (air) around! This is also affected by the size of other gas particles (air) around! Click Here for a Diffusion of Bromine Video

Properties of Gases 6) The pressure of a gas depends on the temperature of a gas. [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_11/FG11_17.JPG] Click Here For a P-T Video Clip

Properties of Gases Kelvins are the temperature units used for any calculation when temperatures affect gases. Kelvins are the temperature units used for any calculation when temperatures affect gases. K = 273 + °C K = 273 + °C [http://abyss.uoregon.edu/~js/images/celsius_kelvin.gif]

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