{"id":1083,"date":"2026-08-13T11:00:22","date_gmt":"2026-08-13T08:00:22","guid":{"rendered":"https:\/\/eduboom.ro\/blog\/?p=1083"},"modified":"2026-06-18T12:39:23","modified_gmt":"2026-06-18T09:39:23","slug":"de-ce-este-cerul-albastru-ce-spune-de-fapt-fizica","status":"publish","type":"post","link":"https:\/\/eduboom.ro\/blog\/de-ce-este-cerul-albastru-ce-spune-de-fapt-fizica\/","title":{"rendered":"De ce este cerul albastru? Ce spune de fapt fizica"},"content":{"rendered":"

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Te-ai uitat vreodat\u0103 \u00een sus \u0219i te-ai \u00eentrebat de ce cerul e albastru \u0219i nu verde, galben sau pur \u0219i simplu transparent? R\u0103spunsul nu are leg\u0103tur\u0103 cu apa sau cu \u201ereflexia m\u0103rii\u201d, cum cred mul\u021bi. Are leg\u0103tur\u0103 cu lumina \u0219i cu felul \u00een care ea se ciocne\u0219te de aer. Hai s\u0103 vedem, pas cu pas.<\/p>\n

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Lumina alb\u0103 nu e chiar alb\u0103<\/h2>\n

Lumina Soarelui pare alb\u0103, dar de fapt este un amestec de toate culorile \u2014 \u00eentregul spectru, de la ro\u0219u la violet. Ai v\u0103zut deja asta: c\u00e2nd lumina trece printr-o prism\u0103 (sau prin pic\u0103turile de ploaie), se desface \u00een curcubeu. Fiecare culoare are o lungime de und\u0103 diferit\u0103: ro\u0219ul are unde lungi, albastrul \u0219i violetul au unde scurte.<\/p>\n

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Ce se \u00eent\u00e2mpl\u0103 c\u00e2nd lumina intr\u0103 \u00een atmosfer\u0103<\/h2>\n

Atmosfera e plin\u0103 de molecule minuscule de aer. C\u00e2nd lumina Soarelui le \u00eent\u00e2lne\u0219te, este \u00eempr\u0103\u0219tiat\u0103 \u00een toate direc\u021biile. Aici e cheia: culorile cu unde scurte (albastru \u0219i violet) sunt \u00eempr\u0103\u0219tiate mult mai puternic dec\u00e2t cele cu unde lungi (ro\u0219u). Fenomenul se nume\u0219te \u00eempr\u0103\u0219tiere Rayleigh.<\/p>\n

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Practic, albastrul este \u201earuncat\u201d \u00een toate p\u0103r\u021bile cerului. Oriunde te-ai uita, vezi aceast\u0103 lumin\u0103 albastr\u0103 \u00eempr\u0103\u0219tiat\u0103 \u2014 de aceea cerul pare albastru pe tot \u00eentinsul lui.<\/p>\n

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\"\"<\/p>\n

\ud83c\udfac Lec\u021bie video eduboom: <\/strong>Propagarea rectilinie a luminii. Viteza luminii<\/em><\/a>\u00a0 \u2014 cum se comport\u0103 lumina; vezi \u0219i Surse de lumin\u0103<\/a> \u0219i Refrac\u021bia luminii<\/a><\/em><\/p>\n

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Atunci de ce nu e cerul violet?<\/h2>\n

Bun\u0103 \u00eentrebare \u2014 violetul are unde \u0219i mai scurte, deci ar trebui \u00eempr\u0103\u0219tiat \u0219i mai mult. Dar ochii no\u0219tri sunt mai sensibili la albastru dec\u00e2t la violet, iar o parte din violet este absorbit\u0103 \u00een atmosfera \u00eenalt\u0103. A\u0219a c\u0103 vedem albastru.<\/p>\n

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De ce apusul e ro\u0219u?<\/h2>\n

La apus, Soarele e jos pe cer, iar lumina lui trebuie s\u0103 str\u0103bat\u0103 un strat mult mai gros de atmosfer\u0103 p\u00e2n\u0103 la ochii t\u0103i. Pe acest drum lung, albastrul este \u00eempr\u0103\u0219tiat complet \u0219i \u201ese pierde\u201d pe parcurs. R\u0103m\u00e2ne s\u0103 ajung\u0103 la tine mai ales ro\u0219ul \u0219i portocaliul \u2014 culorile cu unde lungi. De aceea apusurile sunt \u00een nuan\u021be calde.<\/p>\n

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Concluzie<\/h2>\n

Cerul e albastru pentru c\u0103 aerul \u00eempr\u0103\u0219tie cel mai puternic lumina albastr\u0103 din spectrul solar, iar apusul e ro\u0219u pentru c\u0103, pe un drum mai lung prin atmosfer\u0103, albastrul se pierde \u0219i r\u0103m\u00e2ne ro\u0219ul. Aceea\u0219i lumin\u0103, dou\u0103 culori \u2014 totul \u021bine de c\u00e2t aer traverseaz\u0103. Fizica e peste tot, chiar \u0219i pe cer.<\/p>\n

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Urm\u0103re\u0219te toate nout\u0103\u021bile de pe eduboom \u0219i pe <\/strong>Facebook<\/strong><\/a> \u0219i <\/strong>Instagram<\/strong><\/a>!<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Te-ai uitat vreodat\u0103 \u00een sus \u0219i te-ai \u00eentrebat de ce cerul e albastru \u0219i nu verde, galben sau pur \u0219i simplu transparent? R\u0103spunsul nu are leg\u0103tur\u0103 cu apa sau cu \u201ereflexia m\u0103rii\u201d, cum cred mul\u021bi. Are leg\u0103tur\u0103 cu lumina \u0219i cu felul \u00een care ea se ciocne\u0219te de aer. Hai s\u0103 vedem, pas cu pas. Continue Reading<\/a><\/p>\n","protected":false},"author":13,"featured_media":1085,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[52,15,44,20,46,32,25,27,19,45],"yoast_head":"\nDe ce este cerul albastru? Ce spune de fapt fizica - Blogul eduboom.ro<\/title>\n<meta name=\"description\" content=\"Te-ai \u00eentrebat de ce cerul este albastru, iar apusul ro\u0219u? 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