{"id":7846,"date":"2024-04-06T14:10:06","date_gmt":"2024-04-06T06:10:06","guid":{"rendered":"https:\/\/tommykwan.com\/blog\/?p=7846"},"modified":"2024-04-06T14:55:52","modified_gmt":"2024-04-06T06:55:52","slug":"the-properties-of-air","status":"publish","type":"post","link":"https:\/\/tommykwan.com\/blog\/aviation\/the-properties-of-air\/","title":{"rendered":"The properties of air"},"content":{"rendered":"<p>Ref Ref FAA-H-8083-25C version 2023<\/p>\n<p style=\"text-align: center;\"><strong>Air <\/strong>is <strong>fluid<\/strong><\/p>\n<p>To describe the properties of air, we need to know various key terminology at the beginning<\/p>\n<ol>\n<li>Viscosity<\/li>\n<li>Friction<\/li>\n<li>Pressure<\/li>\n<li>Density<\/li>\n<li>Temperature<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"text-decoration: underline;\">Viscosity<\/span><\/strong><\/p>\n<ul>\n<li>&#8220;friction&#8221; of fluid<\/li>\n<li>is used to describe the<strong> resistance of flowing<\/strong><\/li>\n<li>high viscosity means &#8220;thick&#8221; and resist flowing<\/li>\n<li>low viscosity means &#8220;thin&#8221; and flow easily<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"text-decoration: underline;\">Friction<\/span><\/strong><\/p>\n<ul>\n<li>is talking about <strong>two objects<\/strong> has different property and so when two objects <strong>come into contact<\/strong>, there is a<strong> resistance<\/strong><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"text-decoration: underline;\">Pressure<\/span><\/strong><\/p>\n<p>Pressure = Force \/ Area<\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"text-decoration: underline;\">Density<\/span><\/strong><\/p>\n<p>Density = Mass\/Volume<\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"text-decoration: underline;\">Temperature<\/span><\/strong><\/p>\n<ul>\n<li>average kinetic energy<strong> (K.E) of the particles<\/strong> in a substance or system, it is a terms of Physic<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-7852\" src=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/04\/\u87a2\u5e55\u64f7\u53d6\u756b\u9762-2024-04-06-142736.png\" alt=\"\" width=\"361\" height=\"323\" \/><\/p>\n<p>From about chart, we can see that some of the properties of standard atmosphere. Why?<\/p>\n<p><span style=\"text-decoration: underline;\">Why Altitude increase, the pressure drop, temperature drop? (and air density drop, didn&#8217;t shown here)?<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-7854\" src=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/04\/\u87a2\u5e55\u64f7\u53d6\u756b\u9762-2024-04-06-145451.png\" alt=\"\" width=\"592\" height=\"526\" srcset=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/04\/\u87a2\u5e55\u64f7\u53d6\u756b\u9762-2024-04-06-145451.png 621w, https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/04\/\u87a2\u5e55\u64f7\u53d6\u756b\u9762-2024-04-06-145451-300x267.png 300w\" sizes=\"auto, (max-width: 592px) 100vw, 592px\" \/><\/p>\n<p>It is all about physic &#8211; back to the basic newton&#8217;s law &#8211; the newton&#8217;s 2nd law:<\/p>\n<p style=\"text-align: center;\">Force = ma (Force = mg)<\/p>\n<p>Let us use the god view to look at the earth, since the vertical distance increase, the effect of gravity force will decrease, and so the force acting on the air become less)<\/p>\n<p style=\"text-align: center;\">Pressure = Force \/ Area<\/p>\n<p>Since the force acting on the air drops, and so the pressure drop<\/p>\n<p style=\"text-align: center;\">Air density = Mass of air \/ Volume<\/p>\n<p>Indeed, since the mass of air reduce and so the air density reduce.<\/p>\n<p>In terms of the temperature, we can just use the lapse rate to explain.<\/p>\n<p style=\"text-align: left;\">\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ref Ref FAA-H-8083-25C version 2023 Air is fluid To describe the properties of air, we need to know various key terminology at the beginning Viscosity Friction Pressure Density Temperature &nbsp; Viscosity &#8220;friction&#8221; of fluid is used to describe the resistance of flowing high viscosity means &#8220;thick&#8221; and resist flowing low viscosity means &#8220;thin&#8221; and flow<a class=\"read-more \" href=\"https:\/\/tommykwan.com\/blog\/aviation\/the-properties-of-air\/\" title=\"Read More\"> <span class=\"button default\">Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68,64],"tags":[],"class_list":["post-7846","post","type-post","status-publish","format-standard","hentry","category-atpl-knowledge","category-aviation"],"_links":{"self":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/7846","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/comments?post=7846"}],"version-history":[{"count":6,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/7846\/revisions"}],"predecessor-version":[{"id":7855,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/7846\/revisions\/7855"}],"wp:attachment":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/media?parent=7846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/categories?post=7846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/tags?post=7846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}