{"id":2583,"date":"2016-08-24T13:44:34","date_gmt":"2016-08-24T13:44:34","guid":{"rendered":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/?post_type=chapter&#038;p=2583"},"modified":"2017-08-28T21:42:33","modified_gmt":"2017-08-28T21:42:33","slug":"gas-pressure","status":"publish","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/chapter\/gas-pressure\/","title":{"raw":"Gas Pressure","rendered":"Gas Pressure"},"content":{"raw":"<div class=\"textbox learning-objectives\">\r\n<h3>Learning Objectives<\/h3>\r\n<ul>\r\n \t<li>Define gas pressure.<\/li>\r\n<\/ul>\r\n<\/div>\r\n<div class=\"textbox examples\">\r\n<h3>How are hot air balloons able to move smoothly in the air?<\/h3>\r\n<p id=\"x-ck12-MWZkMjg5ODM2YjExMjdmNWZiZDUyMjkxODU3ODhlZjQ.-8up\"><span class=\"x-ck12-img-inline\"><img src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19212002\/20140811155422714839.jpeg\" alt=\"Hot air balloons float because the air inside expands as it exerts a pressure on the balloon\" width=\"400\" \/><\/span><\/p>\r\n\r\n<h4 id=\"x-ck12-ZmJiMjI1ZjU5ODdkODEzMDBjYWNmYWYzYjgwMTExOWM.-zeq_1-mw2\">How are hot air balloons able to move smoothly in the air?<\/h4>\r\n<p id=\"x-ck12-N2FjMTM5NzYwNmRhMjQ0NTFkZTMyZGRkNTM0MjE2Mzg.-muk\">Many people enjoy riding in hot air balloons. Some use them for romantic picnics and marriage proposals. Others race in competitions. Being above the earth gives a whole new perspective on the world around us. As the beginning of a hot air balloon ride, the balloon is flat because the pressure inside the balloon equals the pressure outside. When the air inside the balloon is heated, the speed of movement of those air molecules increases and the pressure goes up. After a while the balloon is completely expanded and the flight is ready to take off.<\/p>\r\n\r\n<\/div>\r\n<h3>Gas Pressure<\/h3>\r\n<p id=\"x-ck12-YzU4ZmNjOWVjNmQzMTRiOGY0MmU4ZjJiM2RjYmE1MTA.-zwl\"><strong>Pressure <\/strong>is defined as the force per unit area on a surface.<\/p>\r\n<p id=\"x-ck12-amr\" class=\"x-ck12-indent\"><img class=\"x-ck12-block-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19212004\/581a05f050a0ea9a0c77be67240f01a3.png\" alt=\"text{Pressure}=frac{text{force}}{text{area}}\" width=\"130\" height=\"38\" \/><\/p>\r\n<p id=\"x-ck12-Mzg5ZmRhYmY1NzBlMWRiYmM4YWFmOTY3MDliMmNkNTM.-cow\">When a person stands on the floor, his feet exert pressure on the surface. That pressure is related to both the mass of the person and the surface area of his feet. If the person were holding a heavy object, the pressure would increase because of a greater force. Alternatively, if the person stands on his toes, the pressure also increases because of a decrease in the surface area.<\/p>\r\n<p id=\"x-ck12-MjY2NTU1MDM1NjAwOGU3YjEzYTMzOTg4ZjcwYzFlMmM.-gb9\">Gas molecules also exert pressure. Earth\u2019s atmosphere exerts pressure because gravity acts on the huge number of gas particles contained in the atmosphere, holding it in place. Pressure is also exerted by a small sample of gas, such as that which is contained in a balloon. Gas pressure is the pressure that results from <strong>collisions <\/strong>of gas particles with an object. Inside the balloon, the gas particles collide with the balloon\u2019s inner walls. It is those collisions which keep the balloon inflated. If the gas particles were to suddenly stop moving, the balloon would instantly deflate. The\u00a0<strong>Figure <\/strong>below is an illustration of gas particles exerting pressure inside a container.<\/p>\r\n\r\n<div id=\"x-ck12-Yzc5MjhhN2I0ZDNjMzA2YTEzM2NlODM2NTY4OTc4Yzg.-y5b\" class=\"x-ck12-img-thumbnail x-ck12-nofloat\">\r\n<p id=\"x-ck12-i0f\"><img id=\"x-ck12-OTgwNDUtMTM2MzMyNTU1NS02Ni03OS00\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19212004\/20140811155422793943.png\" alt=\"The collision of gas molecules with the walls of a container generates pressure\" longdesc=\"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-admin\/Collision%20of%20gas%20particles%20with%20container%20wall.\" \/><\/p>\r\n<strong>Figure 13.2<\/strong>\r\n<p id=\"x-ck12-ODJmYzQ3YzBkOTQ5NmQ1ZGQxZjRjYTI4NmQ3ZWQ1NjA.-jaz\">Collision of gas particles with container wall.<\/p>\r\n\r\n<\/div>\r\n<p id=\"x-ck12-NWM3ZDI4NTM2ZTY1OTA2YTUzNzhiNDlhMGY1MzI0ZTQ.-oze\">The pressure inside the hot air balloon is affected by temperature. As the molecules heat up, they move faster and strike the inside wall of the balloon harder. This increased motion of the gas particles increases the force on an area of the balloon, producing a rise in the pressure.<\/p>\r\n\r\n<div class=\"textbox key-takeaways\">\r\n<h3>Summary<\/h3>\r\n<ul id=\"x-ck12-YzlkNzRmZTNjMDhlZTRlYTQ3NjViYTA3OWE4MjYzZWM.-dsz\">\r\n \t<li>Pressure is defined as <img class=\"x-ck12-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19212005\/840fa4baa1e03de5a4e7931cd9f189cd.png\" alt=\"frac{text{force}}{text{volume}}\" width=\"41\" height=\"24\" \/> .<\/li>\r\n \t<li>Gas pressure is the result of collisions between gas particles and an object.<\/li>\r\n \t<li>An increase in temperature will produce an increase in pressure of a gas.<\/li>\r\n<\/ul>\r\n<\/div>\r\n<div class=\"textbox exercises\">\r\n<h3>Practice<\/h3>\r\n<p id=\"x-ck12-Y2JlMjQ5M2YzMTNmNmRjMzNmZTI0MTMzYzcwM2IzZmY.-r3s\">Use the link below to answer the following questions:<\/p>\r\n<a href=\"https:\/\/www.grc.nasa.gov\/WWW\/k-12\/airplane\/pressure.html\" target=\"_blank\" rel=\"noopener\">https:\/\/www.grc.nasa.gov\/WWW\/k-12\/airplane\/pressure.html<\/a>\r\n<ol id=\"x-ck12-OWEzMTg2NDI4NmJmZjgzODIxYzZjODVkZDUxZTRiYjQ.-zcr\">\r\n \t<li>What physical properties does a gas particle possess?<\/li>\r\n \t<li>When applying pressure to a gas, how are the forces in the container affected?<\/li>\r\n \t<li>What determines the momentum of a single molecule?<\/li>\r\n<\/ol>\r\n<\/div>\r\n<div class=\"textbox exercises\">\r\n<h3>Review<\/h3>\r\n<ol id=\"x-ck12-NGY5M2JjMjg5N2RmZTVhYjMxZjVjODcxYWZlZTRlYTk.-osc\">\r\n \t<li>What is pressure?<\/li>\r\n \t<li>What causes pressure by a gas?<\/li>\r\n \t<li>What would happen to the pressure if gas particles suddenly stopped moving?<\/li>\r\n \t<li>How does temperature affect pressure?<\/li>\r\n<\/ol>\r\n<\/div>\r\n<div class=\"textbox learning-objectives\">\r\n<h3>Glossary<\/h3>\r\n<div class=\"x-ck12-data-vocabulary\">\r\n<ul id=\"x-ck12-MDY2M2EyNjJkYzg4MjE1ODlmYzVlNTlhMmI1YmI2Nzk.-6jp\">\r\n \t<li><strong>pressure: <\/strong>Defined as <img class=\"x-ck12-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19212005\/840fa4baa1e03de5a4e7931cd9f189cd.png\" alt=\"frac{text{force}}{text{volume}}\" width=\"41\" height=\"24\" \/> .<\/li>\r\n \t<li><strong>collision: <\/strong>When gas particles collide with objects it produces gas pressure.<\/li>\r\n<\/ul>\r\n<\/div>\r\n<\/div>\r\n[reveal-answer q=\"836080\"]Show References[\/reveal-answer]\r\n[hidden-answer a=\"836080\"]\r\n<h2>References<\/h2>\r\n<ol>\r\n \t<li>Meeta. <a href=\"http:\/\/commons.wikimedia.org\/wiki\/File:Hot_Air_Balloon_Ride_by_Sky_Waltz.jpg\">http:\/\/commons.wikimedia.org\/wiki\/File:Hot_Air_Balloon_Ride_by_Sky_Waltz.jpg <\/a>.<\/li>\r\n \t<li>CK-12 Foundation - Christopher Auyeung.<\/li>\r\n<\/ol>\r\n[\/hidden-answer]","rendered":"<div class=\"textbox learning-objectives\">\n<h3>Learning Objectives<\/h3>\n<ul>\n<li>Define gas pressure.<\/li>\n<\/ul>\n<\/div>\n<div class=\"textbox examples\">\n<h3>How are hot air balloons able to move smoothly in the air?<\/h3>\n<p id=\"x-ck12-MWZkMjg5ODM2YjExMjdmNWZiZDUyMjkxODU3ODhlZjQ.-8up\"><span class=\"x-ck12-img-inline\"><img decoding=\"async\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19212002\/20140811155422714839.jpeg\" alt=\"Hot air balloons float because the air inside expands as it exerts a pressure on the balloon\" width=\"400\" \/><\/span><\/p>\n<h4 id=\"x-ck12-ZmJiMjI1ZjU5ODdkODEzMDBjYWNmYWYzYjgwMTExOWM.-zeq_1-mw2\">How are hot air balloons able to move smoothly in the air?<\/h4>\n<p id=\"x-ck12-N2FjMTM5NzYwNmRhMjQ0NTFkZTMyZGRkNTM0MjE2Mzg.-muk\">Many people enjoy riding in hot air balloons. Some use them for romantic picnics and marriage proposals. Others race in competitions. Being above the earth gives a whole new perspective on the world around us. As the beginning of a hot air balloon ride, the balloon is flat because the pressure inside the balloon equals the pressure outside. When the air inside the balloon is heated, the speed of movement of those air molecules increases and the pressure goes up. After a while the balloon is completely expanded and the flight is ready to take off.<\/p>\n<\/div>\n<h3>Gas Pressure<\/h3>\n<p id=\"x-ck12-YzU4ZmNjOWVjNmQzMTRiOGY0MmU4ZjJiM2RjYmE1MTA.-zwl\"><strong>Pressure <\/strong>is defined as the force per unit area on a surface.<\/p>\n<p id=\"x-ck12-amr\" class=\"x-ck12-indent\"><img loading=\"lazy\" decoding=\"async\" class=\"x-ck12-block-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19212004\/581a05f050a0ea9a0c77be67240f01a3.png\" alt=\"text{Pressure}=frac{text{force}}{text{area}}\" width=\"130\" height=\"38\" \/><\/p>\n<p id=\"x-ck12-Mzg5ZmRhYmY1NzBlMWRiYmM4YWFmOTY3MDliMmNkNTM.-cow\">When a person stands on the floor, his feet exert pressure on the surface. That pressure is related to both the mass of the person and the surface area of his feet. If the person were holding a heavy object, the pressure would increase because of a greater force. Alternatively, if the person stands on his toes, the pressure also increases because of a decrease in the surface area.<\/p>\n<p id=\"x-ck12-MjY2NTU1MDM1NjAwOGU3YjEzYTMzOTg4ZjcwYzFlMmM.-gb9\">Gas molecules also exert pressure. Earth\u2019s atmosphere exerts pressure because gravity acts on the huge number of gas particles contained in the atmosphere, holding it in place. Pressure is also exerted by a small sample of gas, such as that which is contained in a balloon. Gas pressure is the pressure that results from <strong>collisions <\/strong>of gas particles with an object. Inside the balloon, the gas particles collide with the balloon\u2019s inner walls. It is those collisions which keep the balloon inflated. If the gas particles were to suddenly stop moving, the balloon would instantly deflate. The\u00a0<strong>Figure <\/strong>below is an illustration of gas particles exerting pressure inside a container.<\/p>\n<div id=\"x-ck12-Yzc5MjhhN2I0ZDNjMzA2YTEzM2NlODM2NTY4OTc4Yzg.-y5b\" class=\"x-ck12-img-thumbnail x-ck12-nofloat\">\n<p id=\"x-ck12-i0f\"><img decoding=\"async\" id=\"x-ck12-OTgwNDUtMTM2MzMyNTU1NS02Ni03OS00\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19212004\/20140811155422793943.png\" alt=\"The collision of gas molecules with the walls of a container generates pressure\" longdesc=\"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-admin\/Collision%20of%20gas%20particles%20with%20container%20wall.\" \/><\/p>\n<p><strong>Figure 13.2<\/strong><\/p>\n<p id=\"x-ck12-ODJmYzQ3YzBkOTQ5NmQ1ZGQxZjRjYTI4NmQ3ZWQ1NjA.-jaz\">Collision of gas particles with container wall.<\/p>\n<\/div>\n<p id=\"x-ck12-NWM3ZDI4NTM2ZTY1OTA2YTUzNzhiNDlhMGY1MzI0ZTQ.-oze\">The pressure inside the hot air balloon is affected by temperature. As the molecules heat up, they move faster and strike the inside wall of the balloon harder. This increased motion of the gas particles increases the force on an area of the balloon, producing a rise in the pressure.<\/p>\n<div class=\"textbox key-takeaways\">\n<h3>Summary<\/h3>\n<ul id=\"x-ck12-YzlkNzRmZTNjMDhlZTRlYTQ3NjViYTA3OWE4MjYzZWM.-dsz\">\n<li>Pressure is defined as <img loading=\"lazy\" decoding=\"async\" class=\"x-ck12-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19212005\/840fa4baa1e03de5a4e7931cd9f189cd.png\" alt=\"frac{text{force}}{text{volume}}\" width=\"41\" height=\"24\" \/> .<\/li>\n<li>Gas pressure is the result of collisions between gas particles and an object.<\/li>\n<li>An increase in temperature will produce an increase in pressure of a gas.<\/li>\n<\/ul>\n<\/div>\n<div class=\"textbox exercises\">\n<h3>Practice<\/h3>\n<p id=\"x-ck12-Y2JlMjQ5M2YzMTNmNmRjMzNmZTI0MTMzYzcwM2IzZmY.-r3s\">Use the link below to answer the following questions:<\/p>\n<p><a href=\"https:\/\/www.grc.nasa.gov\/WWW\/k-12\/airplane\/pressure.html\" target=\"_blank\" rel=\"noopener\">https:\/\/www.grc.nasa.gov\/WWW\/k-12\/airplane\/pressure.html<\/a><\/p>\n<ol id=\"x-ck12-OWEzMTg2NDI4NmJmZjgzODIxYzZjODVkZDUxZTRiYjQ.-zcr\">\n<li>What physical properties does a gas particle possess?<\/li>\n<li>When applying pressure to a gas, how are the forces in the container affected?<\/li>\n<li>What determines the momentum of a single molecule?<\/li>\n<\/ol>\n<\/div>\n<div class=\"textbox exercises\">\n<h3>Review<\/h3>\n<ol id=\"x-ck12-NGY5M2JjMjg5N2RmZTVhYjMxZjVjODcxYWZlZTRlYTk.-osc\">\n<li>What is pressure?<\/li>\n<li>What causes pressure by a gas?<\/li>\n<li>What would happen to the pressure if gas particles suddenly stopped moving?<\/li>\n<li>How does temperature affect pressure?<\/li>\n<\/ol>\n<\/div>\n<div class=\"textbox learning-objectives\">\n<h3>Glossary<\/h3>\n<div class=\"x-ck12-data-vocabulary\">\n<ul id=\"x-ck12-MDY2M2EyNjJkYzg4MjE1ODlmYzVlNTlhMmI1YmI2Nzk.-6jp\">\n<li><strong>pressure: <\/strong>Defined as <img loading=\"lazy\" decoding=\"async\" class=\"x-ck12-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19212005\/840fa4baa1e03de5a4e7931cd9f189cd.png\" alt=\"frac{text{force}}{text{volume}}\" width=\"41\" height=\"24\" \/> .<\/li>\n<li><strong>collision: <\/strong>When gas particles collide with objects it produces gas pressure.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q836080\">Show References<\/span><\/p>\n<div id=\"q836080\" class=\"hidden-answer\" style=\"display: none\">\n<h2>References<\/h2>\n<ol>\n<li>Meeta. <a href=\"http:\/\/commons.wikimedia.org\/wiki\/File:Hot_Air_Balloon_Ride_by_Sky_Waltz.jpg\">http:\/\/commons.wikimedia.org\/wiki\/File:Hot_Air_Balloon_Ride_by_Sky_Waltz.jpg <\/a>.<\/li>\n<li>CK-12 Foundation &#8211; Christopher Auyeung.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n","protected":false},"author":1507,"menu_order":3,"template":"","meta":{"_candela_citation":"[]","CANDELA_OUTCOMES_GUID":"","pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-2583","chapter","type-chapter","status-publish","hentry"],"part":2334,"_links":{"self":[{"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/pressbooks\/v2\/chapters\/2583","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/wp\/v2\/users\/1507"}],"version-history":[{"count":8,"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/pressbooks\/v2\/chapters\/2583\/revisions"}],"predecessor-version":[{"id":3590,"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/pressbooks\/v2\/chapters\/2583\/revisions\/3590"}],"part":[{"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/pressbooks\/v2\/parts\/2334"}],"metadata":[{"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/pressbooks\/v2\/chapters\/2583\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/wp\/v2\/media?parent=2583"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/pressbooks\/v2\/chapter-type?post=2583"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/wp\/v2\/contributor?post=2583"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/wp-json\/wp\/v2\/license?post=2583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}