{"id":1774,"date":"2013-03-17T20:17:37","date_gmt":"2013-03-17T19:17:37","guid":{"rendered":"http:\/\/bmscience.altervista.org\/blog\/?p=1774"},"modified":"2024-02-23T13:56:47","modified_gmt":"2024-02-23T12:56:47","slug":"dalla-pressione-a-stevino","status":"publish","type":"post","link":"https:\/\/bmscience.net\/blog\/dalla-pressione-a-stevino\/","title":{"rendered":"Dalla pressione a Stevino"},"content":{"rendered":"\n<p class=\"has-text-align-left\">In fisica la <strong>pressione<\/strong> \u00e8 il rapporto che c&#8217;\u00e8 tra la forza perpendicolare alla superficie e la sua area. Generalmente indichiamo la pressione con la p minuscola. La formula per calcolare la pressione \u00e8 dunque:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><img decoding=\"async\" src=\"http:\/\/upload.wikimedia.org\/math\/d\/2\/c\/d2cc2c7dc4a3d34ef21d78ac908b636c.png\" alt=\"p = frac {F_{perp}}{S}\"><\/p>\n\n\n\n<p>La pressione \u00e8 una grandezza&nbsp;<strong> scalare<\/strong> e una grandezza <strong>intensiva<\/strong> in quanto si intende sempre riferita all&#8217;unit\u00e0 di superficie.<br>L&#8217;unit\u00e0 di misura nel <strong>Sistema Internazionale<\/strong> \u00e8 il pascal (Pa) ed \u00e8 equivalente ad 1 newton su metro quadrato (n\/m\u00b2). Esistono per\u00f2 altre unit\u00e0 di misure come il <strong>chilogrammo forza<\/strong>&nbsp;(kg<sub>f<\/sub>), <strong>l&#8217;atmosfera<\/strong> (atm) e in <strong>torricelli<\/strong>.<\/p>\n\n\n\n<p>Della pressione ne risentono i fluidi quindi i liquidi e i gas, mentre i solidi risentono delle tensione.<br>Per misurare la pressione abbiamo diversi tipi di strumenti come ad esempio il <strong>barometro<\/strong> o il <strong>manometro<\/strong>.<\/p>\n\n\n<div id=\"bmscience2578161987\" style=\"margin-top: 15px;margin-bottom: 15px;margin-left: auto;margin-right: auto;text-align: center;\"><a href=\"https:\/\/amzn.to\/4kIYBeg\" target=\"_blank\" aria-label=\"81RH6rhG+0L._SX3000_\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/81RH6rhG0L._SX3000_.jpg\" alt=\"\"  srcset=\"https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/81RH6rhG0L._SX3000_.jpg 2188w, https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/81RH6rhG0L._SX3000_-300x69.jpg 300w, https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/81RH6rhG0L._SX3000_-1024x234.jpg 1024w, https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/81RH6rhG0L._SX3000_-768x176.jpg 768w, https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/81RH6rhG0L._SX3000_-1536x351.jpg 1536w, https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/81RH6rhG0L._SX3000_-2048x468.jpg 2048w\" sizes=\"auto, (max-width: 2188px) 100vw, 2188px\" width=\"2188\" height=\"500\"  style=\"display: inline-block;\" \/><\/a><\/div>\n\n\n<p><strong>LA PRESSIONE IDROSTATICA<\/strong><br>La<strong> pressione idrostatica<\/strong> \u00e8 la forza esercitata da un liquido in quiete sulla superficie del recipiente che lo contiene. Grazie ai vari studi di <strong>Stevin Simon<\/strong> (1548-1620) noi possiamo calcolarci la pressione idrostatica tramite la Legge di Stevino.<br>La <strong>Legge di Stevino<\/strong> afferma che la pressione idrostatica p esercitata da un fluido \u00e8 direttamente proporzionale alla sua altezza h e alla sua densit\u00e0 d, cos\u00ec avremo:<\/p>\n\n\n<div id=\"bmscience1676011615\" style=\"margin-top: 15px;margin-left: 15px;float: right;\"><a href=\"https:\/\/amzn.to\/4jTUpaC\" target=\"_blank\" aria-label=\"Screenshot 2025-06-16 161247\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/Screenshot-2025-06-16-161247.png\" alt=\"\"  srcset=\"https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/Screenshot-2025-06-16-161247.png 383w, https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/Screenshot-2025-06-16-161247-300x269.png 300w\" sizes=\"auto, (max-width: 383px) 100vw, 383px\" width=\"300\" height=\"269\"   \/><\/a><\/div>\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title ez-toc-toggle\" style=\"cursor:pointer\">Indice<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #222222;color:#222222\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #222222;color:#222222\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/bmscience.net\/blog\/dalla-pressione-a-stevino\/#pd%C2%B7h%C2%B7g\" >p=d\u00b7h\u00b7g&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/bmscience.net\/blog\/dalla-pressione-a-stevino\/#p_S%C2%B7h%C2%B7d%C2%B7g%C2%B7S-1\" >p= S\u00b7h\u00b7d\u00b7g\u00b7S-1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/bmscience.net\/blog\/dalla-pressione-a-stevino\/#p_h%C2%B7d%C2%B7g\" >p= h\u00b7d\u00b7g<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/bmscience.net\/blog\/dalla-pressione-a-stevino\/#p_h%C2%B7d%C2%B7g_p0\" >p= h\u00b7d\u00b7g + p0<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading has-text-align-center\"><span class=\"ez-toc-section\" id=\"pd%C2%B7h%C2%B7g\"><\/span><em>p=d\u00b7h\u00b7g&nbsp;<\/em><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Quindi avremo che la pressione idrostatica (N\/m\u00b2) \u00e8 uguale al prodotto tra la densit\u00e0 (kg\/m\u00b3), l&#8217;altezza (m) e la costante gravitazionale g (N\/kg) che equivale a 9.8N.<br>Ms come ci si arriva a questa formula? Prendiamo in considerazione la formula della pressione:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><img decoding=\"async\" src=\"http:\/\/upload.wikimedia.org\/math\/d\/2\/c\/d2cc2c7dc4a3d34ef21d78ac908b636c.png\" alt=\"p = frac {F_{perp}}{S}\"><\/p>\n\n\n\n<p class=\"has-text-align-left\">La forza F si calcola tramite in prodotto delle massa m per la costante gravitazionale; ma \u00e8 anche vero che la massa m \u00e8 uguale al prodotto del volume V per la densit\u00e0. Inoltre il volume \u00e8 uguale al prodotto dell&#8217;area S per l&#8217;altezza h.<br>Avremo dunque che la forza F \u00e8 uguale all&#8217;area S per l&#8217;altezza h per la densit\u00e0 per la costante gravitazionale g.<br>Andando a sostituire nella formula precedente avremo che:<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\"><span class=\"ez-toc-section\" id=\"p_S%C2%B7h%C2%B7d%C2%B7g%C2%B7S-1\"><\/span><strong>p= S\u00b7h\u00b7d\u00b7g\u00b7S<sup>-1<\/sup><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Possiamo notare che la S al numeratore e quella al denominatore si possono eliminare e perci\u00f2 resta la formula:<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\"><span class=\"ez-toc-section\" id=\"p_h%C2%B7d%C2%B7g\"><\/span>p= h\u00b7d\u00b7g<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>La pressione idrostatica \u00e8 la forza che un liquido esercita sul fondo del recipiente che lo contiene. Non bisogna pertanto trascurare un&#8217;altra forza che \u00e8 quelle che viene esercitata dall&#8217;aria sul pelo del liquido. Per calcolare la pressione idrostatica tenendo conto delle pressione atmosferica p con 0 si avr\u00e0:<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\"><span class=\"ez-toc-section\" id=\"p_h%C2%B7d%C2%B7g_p0\"><\/span>p= h\u00b7d\u00b7g + p<sub>0<\/sub><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<div id=\"bmscience2621864106\" style=\"margin-top: 15px;margin-bottom: 15px;margin-left: auto;margin-right: auto;text-align: center;\"><a href=\"https:\/\/amzn.to\/44mFDDm\" target=\"_blank\" aria-label=\"Screenshot 2025-06-30 173808\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/Screenshot-2025-06-30-173808.png\" alt=\"\"  srcset=\"https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/Screenshot-2025-06-30-173808.png 1562w, https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/Screenshot-2025-06-30-173808-300x70.png 300w, https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/Screenshot-2025-06-30-173808-1024x240.png 1024w, https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/Screenshot-2025-06-30-173808-768x180.png 768w, https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2025\/06\/Screenshot-2025-06-30-173808-1536x360.png 1536w\" sizes=\"auto, (max-width: 1562px) 100vw, 1562px\" width=\"1562\" height=\"366\"  style=\"display: inline-block;\" \/><\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>In fisica la pressione \u00e8 il rapporto che c&#8217;\u00e8 tra la forza perpendicolare alla superficie e la sua area. Generalmente indichiamo la pressione con la p minuscola. La formula per calcolare la pressione \u00e8 dunque&#8230;<\/p>\n","protected":false},"author":3,"featured_media":9150,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","footnotes":""},"categories":[60],"tags":[416,695,2025,2210,3213,3275,4351,4673,5554,5930,5932,5940,8052],"class_list":["post-1774","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fisica","tag-altezza","tag-area","tag-costante-gravitazionale","tag-densita","tag-fluidi","tag-forza","tag-legge","tag-massa","tag-pascal","tag-pressione","tag-pressione-atmosferica","tag-pressione-idrostatica","tag-volume","entry"],"author_meta":{"display_name":"Cecilia","author_link":"https:\/\/bmscience.net\/blog\/author\/cecilia\/"},"featured_img":"https:\/\/bmscience.net\/blog\/wp-content\/uploads\/2013\/03\/images21-300x160.jpg","coauthors":[],"tax_additional":{"categories":{"linked":["<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">Fisica<\/a>"],"unlinked":["<span class=\"advgb-post-tax-term\">Fisica<\/span>"]},"tags":{"linked":["<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">altezza<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">area<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">costante gravitazionale<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">densit\u00e0<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">fluidi<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">forza<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">legge<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">massa<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">pascal<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">pressione<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">pressione atmosferica<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">pressione idrostatica<\/a>","<a href=\"https:\/\/bmscience.net\/blog\/category\/scienze-naturali\/fisica\/\" class=\"advgb-post-tax-term\">volume<\/a>"],"unlinked":["<span class=\"advgb-post-tax-term\">altezza<\/span>","<span class=\"advgb-post-tax-term\">area<\/span>","<span class=\"advgb-post-tax-term\">costante gravitazionale<\/span>","<span class=\"advgb-post-tax-term\">densit\u00e0<\/span>","<span class=\"advgb-post-tax-term\">fluidi<\/span>","<span class=\"advgb-post-tax-term\">forza<\/span>","<span class=\"advgb-post-tax-term\">legge<\/span>","<span class=\"advgb-post-tax-term\">massa<\/span>","<span class=\"advgb-post-tax-term\">pascal<\/span>","<span class=\"advgb-post-tax-term\">pressione<\/span>","<span class=\"advgb-post-tax-term\">pressione atmosferica<\/span>","<span class=\"advgb-post-tax-term\">pressione idrostatica<\/span>","<span class=\"advgb-post-tax-term\">volume<\/span>"]}},"comment_count":"0","relative_dates":{"created":"Pubblicato 13 anni fa","modified":"Aggiornato 2 anni fa"},"absolute_dates":{"created":"Pubblicato il 17\/03\/2013","modified":"Aggiornato il 23\/02\/2024"},"absolute_dates_time":{"created":"Pubblicato il 17\/03\/2013 20:17","modified":"Aggiornato il 23\/02\/2024 13:56"},"featured_img_caption":"","series_order":"","_links":{"self":[{"href":"https:\/\/bmscience.net\/blog\/wp-json\/wp\/v2\/posts\/1774","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bmscience.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bmscience.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bmscience.net\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/bmscience.net\/blog\/wp-json\/wp\/v2\/comments?post=1774"}],"version-history":[{"count":0,"href":"https:\/\/bmscience.net\/blog\/wp-json\/wp\/v2\/posts\/1774\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bmscience.net\/blog\/wp-json\/wp\/v2\/media\/9150"}],"wp:attachment":[{"href":"https:\/\/bmscience.net\/blog\/wp-json\/wp\/v2\/media?parent=1774"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bmscience.net\/blog\/wp-json\/wp\/v2\/categories?post=1774"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bmscience.net\/blog\/wp-json\/wp\/v2\/tags?post=1774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}