{"id":4441,"date":"2021-01-26T22:31:49","date_gmt":"2021-01-26T22:31:49","guid":{"rendered":"http:\/\/www.benateckyctyrlistek.eu\/?p=4441"},"modified":"2021-12-13T07:49:52","modified_gmt":"2021-12-13T07:49:52","slug":"snih","status":"publish","type":"post","link":"https:\/\/www.benateckyctyrlistek.eu\/?p=4441","title":{"rendered":"Sn\u00edh"},"content":{"rendered":"

\"img00017\"<\/a>Sn\u00edh je specifick\u00e1 forma ledu, pevn\u00e9ho skupenstv\u00ed vody. Je tvo\u0159en ledov\u00fdmi krystalky seskupen\u00fdmi do sn\u011bhov\u00fdch vlo\u010dek. V p\u0159\u00edrod\u011b vznik\u00e1 p\u0159irozen\u011b za vhodn\u00fdch klimatick\u00fdch podm\u00ednek v oblac\u00edch na p\u0159ev\u00e1\u017en\u011b biologick\u00e9m podkladu jako jsou bakterie, odkud se sn\u00e1\u0161\u00ed k zemi. Tento d\u011bj se naz\u00fdv\u00e1 sn\u011b\u017een\u00ed. Sn\u00edh nahromad\u011bn\u00fd ve v\u011bt\u0161\u00edm mno\u017estv\u00ed na dostate\u010dn\u011b prochladl\u00e9m zemsk\u00e9m povrchu se naz\u00fdv\u00e1 sn\u011bhov\u00e1 pokr\u00fdvka. Na rozd\u00edl od de\u0161\u0165ov\u00e9 vody z m\u00edsta dopadu ihned neodt\u00e9k\u00e1, p\u0159edstavuje tak d\u016fle\u017eit\u00fd prvek v kolob\u011bhu vody v p\u0159\u00edrod\u011b. V\u00fdznamn\u00e1 je tak\u00e9 jeho tepeln\u011b izola\u010dn\u00ed schopnost, kter\u00e1 umo\u017e\u0148uje mnoha rostlinn\u00fdm i \u017eivo\u010di\u0161n\u00fdm druh\u016f p\u0159e\u010dkat mrazy.<\/p>\n

Za podm\u00ednek panuj\u00edc\u00edch obvykle v oblac\u00edch krystalizuje voda ve f\u00e1zi ledu \u00a0v \u0161estere\u010dn\u00e9 krystalografick\u00e9 soustav\u011b. To ur\u010duje \u0161estere\u010dnou symetrii vlo\u010dek. Krystalky jsou formov\u00e1ny \"img00006\"<\/a>v podm\u00ednk\u00e1ch n\u00edzk\u00e9 prostorov\u00e9 koncentrace molekul vody. Proto nevznik\u00e1 celistv\u00e1 masa, jak lze b\u011b\u017en\u011b pozorovat p\u0159i p\u0159echodu vody do pevn\u00e9ho skupenstv\u00ed na zemsk\u00e9m povrchu. Jejich tvar je d\u00e1n lok\u00e1ln\u00ed kombinac\u00ed teploty, tlaku a koncentrace molekul vody (vlhkosti). Sn\u011bhov\u00e9 vlo\u010dky vznikaj\u00ed akrec\u00ed ledov\u00fdch krystalk\u016f. P\u0159i n\u00ed je obvykle symetrie m\u00edrn\u011b poru\u0161ena. P\u0159i sestupu k povrchu se mohou je\u0161t\u011b agregovat do v\u011bt\u0161\u00edch shluk\u016f op\u011bt v z\u00e1vislosti na klimatick\u00fdch podm\u00ednk\u00e1ch.<\/p>\n

Dal\u0161\u00edm faktorem ovliv\u0148uj\u00edc\u00edm tvar a velikost vlo\u010dky je \u010das. Jevy akrece i agregace vy\u017eaduj\u00ed fyzick\u00e9 p\u0159emis\u0165ov\u00e1n\u00ed ledov\u00fdch krystalk\u016f, jsou proto relativn\u011b pomal\u00e9. P\u0159i napodobov\u00e1n\u00ed tvorby sn\u011bhu pomoc\u00ed sn\u011b\u017en\u00fdch d\u011bl jsou vlo\u010dky formov\u00e1ny v omezen\u00e9m \u010dase, proto jsou obecn\u011b men\u0161\u00ed. V d\u016fsledku toho je technick\u00fd sn\u00edh od p\u0159\u00edrodn\u00edho rozpoznateln\u00fd, je hutn\u011bj\u0161\u00ed.<\/p>\n

P\u0159\u00edtomnost symetrick\u00fdch krystalk\u016f v mrac\u00edch m\u016f\u017ee p\u0159i vhodn\u00e9 poloze Slunce vyvolat halov\u00e9 jevy.<\/p>\n","protected":false},"excerpt":{"rendered":"

Sn\u00edh je specifick\u00e1 forma ledu, pevn\u00e9ho skupenstv\u00ed vody. Je tvo\u0159en ledov\u00fdmi krystalky seskupen\u00fdmi do sn\u011bhov\u00fdch vlo\u010dek. V p\u0159\u00edrod\u011b vznik\u00e1 p\u0159irozen\u011b za vhodn\u00fdch klimatick\u00fdch podm\u00ednek v oblac\u00edch na p\u0159ev\u00e1\u017en\u011b biologick\u00e9m podkladu jako jsou<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_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":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[8],"tags":[],"class_list":["post-4441","post","type-post","status-publish","format-standard","hentry","category-clanky"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/s4YkmD-snih","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/posts\/4441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4441"}],"version-history":[{"count":3,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/posts\/4441\/revisions"}],"predecessor-version":[{"id":4446,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/posts\/4441\/revisions\/4446"}],"wp:attachment":[{"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4441"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4441"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}