{"id":598,"date":"2007-01-05T06:00:00","date_gmt":"2007-01-04T22:00:00","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=598"},"modified":"2010-11-11T18:22:36","modified_gmt":"2010-11-11T10:22:36","slug":"%e5%a4%a9%e7%a9%ba%e7%82%ba%e7%94%9a%e9%ba%bc%e6%98%af%e8%97%8d%e8%89%b2%e7%9a%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e5%a4%a9%e7%a9%ba%e7%82%ba%e7%94%9a%e9%ba%bc%e6%98%af%e8%97%8d%e8%89%b2%e7%9a%84%ef%bc%9f\/","title":{"rendered":"\u5929\u7a7a\u70ba\u751a\u9ebc\u662f\u85cd\u8272\u7684\uff1f"},"content":{"rendered":"

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2007\u5e741\u67085\u65e5\uff1a\u6674<\/p>\n

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<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

2007年1月5日：晴 天空為甚麼是藍色的？日出日落時，天空又為甚麼變成紅色？ 我們肉眼可見的太陽光，其實由不同顏色的光組成。  光是電磁波的一種，電磁波有波長，不同顏色的光有不同波長。其中紅光的波長最長，紫光的波長最短。 光以直線前進，但當遇到大氣中的塵粒、水滴或氣體時便會出現變化。其中塵粒、水滴會把光反射，以另一方向前進。 當光遇到氣體時，會被氣體吸收，不同波長的光被吸收的程度不同。長波長的光（例如紅光和橙光）被吸收的程度較低，短波長的光（例如藍光和綠光）被吸收的程度較高。氣體吸收光後會以輻射的形式把光向不同方向射出，稱為散射（scattering）。 太陽光射進地球大氣時，藍光被吸收及散射，我們抬頭看天空便見到藍色。接近地面的天空藍色較淺，因為被散射的藍光要經過較長距離才到達眼睛，途中被進一步吸收及散射。  （來源：http:\/\/www.sciencemadesimple.com\/） 太空由於沒有大氣，光沒有被吸收和散射，所以天空是黑色的。 日出日落時，太陽光經過較長距離才到達眼睛。波長較短的藍光和綠光被吸收及散射，只剩下紅光和橙光，因此太陽變成紅色。 假如當時大氣有大量塵粒或水滴，把紅光和橙光反射，天空亦會變成紅色。 （來源：http:\/\/www.sciencemadesimple.com\/） 這解釋為甚麼日出日落時，如果天空變成紅色，天氣可能轉壞。<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4],"tags":[],"class_list":["post-598","post","type-post","status-publish","format-standard","hentry","category-4"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/598","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/comments?post=598"}],"version-history":[{"count":1,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/598\/revisions"}],"predecessor-version":[{"id":721,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/598\/revisions\/721"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=598"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=598"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=598"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}