{"id":84,"date":"2023-06-26T06:28:12","date_gmt":"2023-06-26T06:28:12","guid":{"rendered":"https:\/\/physigeek.com\/it\/scala-di-temperatura-kelvin\/"},"modified":"2023-06-26T06:28:12","modified_gmt":"2023-06-26T06:28:12","slug":"scala-di-temperatura-kelvin","status":"publish","type":"post","link":"https:\/\/physigeek.com\/it\/scala-di-temperatura-kelvin\/","title":{"rendered":"Kelvin (scala di temperatura)"},"content":{"rendered":"<p>Questo articolo spiega cos&#8217;\u00e8 Kelvin e cos&#8217;\u00e8 la scala Kelvin. Scoprirai come convertire una temperatura espressa in kelvin in altre unit\u00e0 di temperatura e, inoltre, potrai convertire i kelvin in gradi Celsius o gradi Fahrenheit con un convertitore online.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-el-kelvin\"><\/span> Cos&#8217;\u00e8 Kelvin?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Il <strong>Kelvin<\/strong> , storicamente chiamato <strong>grado Kelvin<\/strong> , \u00e8 l&#8217;unit\u00e0 di temperatura nel Sistema Internazionale di Unit\u00e0 (SI).<\/p>\n<p> D&#8217;altra parte, la <strong>scala Kelvin<\/strong> \u00e8 la scala di temperatura in cui lo zero assoluto rappresenta l&#8217;assenza di energia, il cui valore \u00e8 0 Kelvin (-273,15 \u00baC).<\/p>\n<p> Il simbolo utilizzato per esprimere una temperatura in Kelvin \u00e8 la lettera maiuscola K, ad esempio 300 K.<\/p>\n<p> In fisica, il kelvin non \u00e8 considerato un grado e quindi il nome corretto per questa unit\u00e0 di temperatura \u00e8 kelvin, non <em>grado Kelvin<\/em> . Inoltre, a differenza dei gradi Celsius (\u00baC) e dei gradi Fahrenheit (\u00baF), non va scritto con il simbolo dei gradi, ma semplicemente con la lettera K.<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-05df675eb7d5e9fe681327bdcca948c8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"350 \\ \u00baK\\ \\color{red}\\bm{\\times} \\color{black}\\ \\longrightarrow \\ 350 \\ K\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"233\" style=\"vertical-align: -1px;\"><\/p>\n<\/p>\n<p> Va notato che sebbene il kelvin sia l&#8217;unit\u00e0 di temperatura del Sistema Internazionale, non \u00e8 l&#8217;unit\u00e0 pi\u00f9 comunemente utilizzata per esprimere la temperatura. S\u00ec, \u00e8 vero che sia in fisica che in ingegneria i calcoli si fanno in Kelvin, ma nella vita di tutti i giorni le temperature vengono solitamente misurate in gradi Celsius o gradi Fahrenheit. Ecco perch\u00e9 vedremo di seguito come passare da determinate unit\u00e0 di temperatura ad altre. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conversion-de-kelvin-a-grados-Celsius\"><\/span> Conversione da Kelvin a gradi Celsius<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Lo zero della scala Kelvin (0 K) equivale a -273,15\u00baC, quindi per <strong>convertire una temperatura espressa in Kelvin in gradi Celsius (o Celsius),<\/strong> \u00e8 necessario sottrarre 273,15 unit\u00e0 dal valore della temperatura.<\/p>\n<p> Pertanto, la formula che permette di convertire un valore dalla scala Kelvin alla scala Celsius \u00e8 la seguente:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-3de831582a96e350afd9a292ff810653_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" \\definecolor{blauquadreexample}{HTML}{4FD12F} \\newtcbox{\\mymath}[1][]{% nobeforeafter, math sup\u00e9rieur, tcbox raise base, am\u00e9lior\u00e9, colframe=blauquadreexample, boxrule=1pt, boxsep=2mm, #1} \\begin{empheq}[box={\\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{blauquadreexample!20!white,} ]}]{equation*} \\displaystyle \u00baC= K-273.15 \\end{empheq} \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"310\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Se ad esempio vogliamo convertire 450 K in gradi Celsius, sottraiamo semplicemente 273,15 dalla misura:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-49ff44bd3e11e98103cce115c9c91c2f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\definecolor{vert}{HTML}{4FD12F} 450 \\ K \\ \\color{vert}\\bm{\\longrightarrow}\\color{noir} \\ \u00baC \\ \\color{green}\\bm{?}\\color{ noir}\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"424\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-6d9872272f44e0348d4f2d4f6618d474_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\u00baC=450-273,15=176,85 \\ \u00baC\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"234\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p> Per <strong>convertire invece una temperatura espressa in gradi Celsius in Kelvin<\/strong> \u00e8 necessario aggiungere alla temperatura 273,15.<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-e50826f6b85bf9930df9bf113126b248_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" \\definecolor{verd}{HTML}{4FD12F} \\newtcbox{\\mymath}[1][]{% nobeforeafter, math sup\u00e9rieur, tcbox raise base, am\u00e9lior\u00e9, colframe=verd, boxrule=1pt, boxsep=2mm, #1} \\begin{empheq}[box={\\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{green!20!white,} ]}]{equation*} \\displaystyle K= \u00baC+273,15 \\end{empheq} \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"192\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> A titolo di esempio, la conversione di 25\u00b0C nella scala Kelvin \u00e8 mostrata di seguito:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-cd95bda80b5edb3191762d4395109b4a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\definecolor{vert}{HTML}{4FD12F} 25 \\ \u00baC \\ \\color{vert}\\bm{\\longrightarrow}\\color{noir} \\ K \\ \\color{green}\\bm{?}\\color{ noir}\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"416\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-cba892f753f9e09fdad9ac3c2b11b41a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"K=25+273,15=298,15 \\ K\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"229\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conversion-de-kelvin-a-grados-Fahrenheit\"><\/span> Conversione da Kelvin a Fahrenheit<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Abbiamo appena visto come convertire una temperatura da Kelvin a gradi Celsius, tuttavia \u00e8 molto utilizzata anche la scala Fahrenheit. Quindi in questa sezione vedremo come passare dalla scala Kelvin alla scala Fahrenheit e viceversa, poich\u00e9 il calcolo non \u00e8 diretto come nella scala Celsius.<\/p>\n<p> Per <strong>convertire una temperatura dalla scala Kelvin alla scala Fahrenheit<\/strong> \u00e8 sufficiente sostituire il valore della temperatura espresso in Kelvin nella seguente formula ed effettuare i calcoli:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-90a8934e8f855e60d4ba507a67185503_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" \\definecolor{verd}{HTML}{4FD12F} \\newtcbox{\\mymath}[1][]{% nobeforeafter, math sup\u00e9rieur, tcbox raise base, am\u00e9lior\u00e9, colframe=verd, boxrule=1pt, boxsep=2mm, #1} \\begin{empheq}[box={\\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{green!20!white,} ]}]{equation*} \\displaystyle \u00baF= 1,8\\cdot (K-273,15)+32 \\end{empheq} \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"192\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Ad esempio, la conversione di 500 K in gradi Fahrenheit viene eseguita come segue:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-6536e287f7c608e83df83e9d3fecac67_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\definecolor{vert}{HTML}{4FD12F} 500 \\ K \\ \\color{vert}\\bm{\\longrightarrow}\\color{black} \\ \u00baF \\ \\color{green}\\bm{?}\\color{ noir}\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"431\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-15a63236d1afd28031d3256d91a1fb93_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F=1,8\\cdot (500-273,15)+32=440,33 \\ \u00baF\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"325\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Allo stesso modo, la formula per effettuare la conversione inversa, cio\u00e8 <strong>passare dai gradi Fahrenheit ai kelvin<\/strong> , si ottiene isolando il coefficiente della scala kelvin dalla formula precedente:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-baff637c712d8293b69ae027c7d6a90c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" \\definecolor{verd}{HTML}{4FD12F} \\newtcbox{\\mymath}[1][]{% nobeforeafter, math sup\u00e9rieur, tcbox raise base, am\u00e9lior\u00e9, colframe=verd, boxrule=1pt, boxsep=2mm, #1} \\begin{empheq}[box={\\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{verd!20!white,} ]}]{equation*} \\displaystyle K= \\cfrac{\u00baF-32}{1.8}+273.15 \\end{empheq} \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"192\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Per farvi vedere come passa il valore di una temperatura tra queste due misurazioni, \u00e8 stato risolto un esempio: <\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-b577b31cebd30099db83223061e23ef1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\definecolor{verd}{HTML}{4FD12F} 250 \\ \u00baF \\ \\color{verd}\\bm{\\longrightarrow}\\color{black} \\ K \\ \\color{verd}\\bm{?}\\color{ noir}\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"427\" style=\"vertical-align: -1px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-c84a703969d9e96846662a8be28b6d84_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"K=\\cfrac{250-32}{1.8}+273.15=394.26 \\ K\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"274\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conversor-de-kelvin-a-grados-Celsius-y-grados-Fahrenheit\"><\/span> Convertitore da Kelvin a Celsius e Fahrenheit<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Per facilitare la conversione tra le diverse unit\u00e0 di temperatura \u00e8 stato creato il seguente calcolatore online con il quale \u00e8 possibile convertire un valore di temperatura tra le scale termometriche Kelvin, Celsius e Fahrenheit.<\/p>\n<p> Per utilizzare la calcolatrice, \u00e8 necessario selezionare le unit\u00e0 della temperatura inserita e scriverne il valore utilizzando il punto (.) come separatore decimale.<\/p>\n<form action=\"\" method=\"post\">\n<ul style=\"color:#4FD12F\">\n<li> <span style=\"color:#101010;font-weight: normal;\"><select name=\"temperatura\" style=\"border:1.5px solid #CACFD2; border-radius:5px;  padding:7px; color:#000000; background-color:#F2F3F4;\" placeholder=\"7\">Gradi<option value=\"kelvin\">Kelvin<\/option>Gradi<option value=\"celsius\">Celsius<\/option><option value=\"fahrenheit\">Fahrenheit<\/option><\/select> = <input name=\"datos\" style=\"border:1.5px solid #4FD12F; border-radius:5px;  padding:7px; color:#000000; background-color:#EEFCEB;\" placeholder=\"85.39\" required=\"\" oninvalid=\"this.setCustomValidity('Introduce la temperatura aqu\u00ed')\" oninput=\"this.setCustomValidity('')\"><\/span> <\/li>\n<\/ul>\n<div style=\"text-align:center\"><input align=\"center\" style=\"font-size:105%; border-radius:30px; margin: 20px;\" type=\"submit\" name=\"submit\" value=\"Convertire\"><\/div>\n<\/form>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Origen-del-kelvin\"><\/span> Origine di Kelvin<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> In quest&#8217;ultima sezione vedremo la storia legata al kelvin, perch\u00e9 nonostante sia l&#8217;unit\u00e0 del Sistema Internazionale, curiosamente non \u00e8 l&#8217;unit\u00e0 di temperatura pi\u00f9 utilizzata.<\/p>\n<p> Prima della scala Kelvin sono state sviluppate le scale termometriche Fahrenheit e Celsius, motivo per cui oggi queste due unit\u00e0 sono maggiormente utilizzate nella vita di tutti i giorni.<\/p>\n<p> Tuttavia, queste scale non sono pratiche poich\u00e9 consentono temperature negative. Poi, nel 1848, William Thomson cre\u00f2 la <strong>scala di temperatura termodinamica Kelvin<\/strong> , che prende la temperatura zero assoluto come punto zero della scala. Pertanto sono consentite solo temperature positive.<\/p>\n<p> Poi, nel 1954, durante la Decima Conferenza Generale sui Pesi e le Misure (CGPM), la temperatura del punto triplo dell&#8217;acqua (273,16 K) fu definita come il secondo punto di riferimento sulla scala Kelvin.<\/p>\n<p> Successivamente, nel 1967\/1968, durante il 13\u00b0 CGPM, si concluse che un kelvin corrispondeva all&#8217;aumento di un&#8217;unit\u00e0 di temperatura. Allo stesso modo, il kelvin smise di essere considerato un &#8220;grado&#8221; e il simbolo K sostitu\u00ec quindi il \u00baK. Da quel momento in poi \u00e8 diventato sbagliato dire <em>gradi kelvin<\/em> , si dovrebbe semplicemente dire <em>kelvin<\/em> .<\/p>\n<p> Infine, a partire dal 26\u00b0 CGPM, tenutosi nel 2018, il kelvin \u00e8 stato ridefinito sulla base della costante di Boltzmann, un metodo sperimentalmente pi\u00f9 rigoroso.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Questo articolo spiega cos&#8217;\u00e8 Kelvin e cos&#8217;\u00e8 la scala Kelvin. Scoprirai come convertire una temperatura espressa in kelvin in altre unit\u00e0 di temperatura e, inoltre, potrai convertire i kelvin in gradi Celsius o gradi Fahrenheit con un convertitore online. Cos&#8217;\u00e8 Kelvin? Il Kelvin , storicamente chiamato grado Kelvin , \u00e8 l&#8217;unit\u00e0 di temperatura nel Sistema &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/it\/scala-di-temperatura-kelvin\/\"> <span class=\"screen-reader-text\">Kelvin (scala di temperatura)<\/span> Leggi altro &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","footnotes":""},"categories":[16],"tags":[],"class_list":["post-84","post","type-post","status-publish","format-standard","hentry","category-unita"],"yoast_head":"<!-- This site is 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