{"id":556,"date":"2005-12-26T06:00:00","date_gmt":"2005-12-25T22:00:00","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=556"},"modified":"2010-11-11T18:28:28","modified_gmt":"2010-11-11T10:28:28","slug":"%e7%9b%b8%e5%b0%8d%e6%bf%95%e5%ba%a6%e8%88%87%e9%9c%b2%e9%bb%9e","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e7%9b%b8%e5%b0%8d%e6%bf%95%e5%ba%a6%e8%88%87%e9%9c%b2%e9%bb%9e\/","title":{"rendered":"\u76f8\u5c0d\u6fd5\u5ea6\u8207\u9732\u9ede"},"content":{"rendered":"

\t\t\t\t\t\t\t\t\t\u76f8\u5c0d\u6fd5\u5ea6\u662f\u8868\u793a\u7a7a\u6c23\u6f6e\u6fd5\u7a0b\u5ea6\u7684\u5e38\u7528\u6307\u6a19\u3002\u90a3\u9ebc\u6c23\u6eab10\u5ea6\uff0c\u76f8\u5c0d\u6fd5\u5ea620%\u8ddf\u6c23\u6eab30\u5ea6\uff0c\u76f8\u5c0d\u6fd5\u5ea620%\u6709\u751a\u9ebc\u4e0d\u540c\uff1f\u00a0 <\/p>\n

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\u7531\u65bc\u76f8\u5c0d\u6fd5\u5ea6\u53d7\u6c23\u6eab\u8b8a\u5316\u5f71\u97ff\uff0c\u6c23\u8c61\u5b78\u4e0a\u6211\u5011\u4f7f\u7528\u9732\u9ede\uff08dew point\uff09\u8868\u793a\u6fd5\u5ea6\u3002\u9732\u9ede\u662f\u5047\u8a2d\u58d3\u529b\u4e0d\u8b8a\uff0c\u628a\u7a7a\u6c23\u51b7\u537b\u81f3\u98fd\u548c\uff08\u76f8\u5c0d\u6fd5\u5ea6100%\uff09\u6642\u7684\u6eab\u5ea6\u3002<\/p>\n

\u6211\u5011\u53ef\u8a08\u7b97<\/a>\u4e0a\u8ff0\u60c5\u6cc1\u7684\u9732\u9ede\uff08\u6c23\u58d3\u53ef\u8f38\u51651013millibars\uff09\uff1a<\/p>\n

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\uff08b\uff09\u6c23\u6eab30\u5ea6\uff0c\u76f8\u5c0d\u6fd5\u5ea620%\uff0c\u9732\u9ede\u70ba4.6\u5ea6<\/p>\n

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\u9867\u540d\u601d\u7fa9\uff0c\u9732\u9ede\u8207\u9732\uff08\u6216\u971c\uff09\u7684\u51fa\u73fe\u6709\u95dc\u3002\u7576\u5730\u9762\u6c23\u6eab\u964d\u81f3\u9732\u9ede\uff0c\u7a7a\u6c23\u4e2d\u6c34\u6c7d\u51dd\u7d50\u6210\u6c34\u6ef4\u6210\u70ba\u9732\u3002\u5982\u9732\u9ede\u4f4e\u65bc\u51b0\u9ede\uff0c\u6c34\u6c7d\u51dd\u7d50\u6210\u51b0\u6210\u70ba\u971c\u3002<\/p>\n

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

相對濕度是表示空氣潮濕程度的常用指標。那麼氣溫10度，相對濕度20%跟氣溫30度，相對濕度20%有甚麼不同？  相對濕度（relative humidity）是一個比值，表示現時空氣中水汽含量與空氣飽和時水汽含量之比。由於氣溫較高時可容納較多水汽，假如空氣中水汽含量不變，氣溫上升\/下降會令相對濕度下降\/上升，這亦解釋為何下午的相對濕度較低。 由於相對濕度受氣溫變化影響，氣象學上我們使用露點（dew point）表示濕度。露點是假設壓力不變，把空氣冷卻至飽和（相對濕度100%）時的溫度。 我們可計算上述情況的露點（氣壓可輸入1013millibars）： （a）氣溫10度，相對濕度20%，露點為-12.0度（b）氣溫30度，相對濕度20%，露點為4.6度 露點越低，表示空氣中水汽含量越少（想想原因？）。雖然（a）及（b）情況之相對濕度相同，但前者空氣中之水汽含量比後者為低。 只要空氣中水汽含量不變，露點不受氣溫、氣壓變化影響。 顧名思義，露點與露（或霜）的出現有關。當地面氣溫降至露點，空氣中水汽凝結成水滴成為露。如露點低於冰點，水汽凝結成冰成為霜。 冬天寒潮南下時，露點在冷暖空氣交界面附近常出現明顯差異，可以用來介定冷鋒的位置。<\/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-556","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\/556","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=556"}],"version-history":[{"count":1,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/556\/revisions"}],"predecessor-version":[{"id":762,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/556\/revisions\/762"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=556"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=556"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=556"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}