{"id":7972,"date":"2021-03-10T16:07:49","date_gmt":"2021-03-10T15:07:49","guid":{"rendered":"https:\/\/www.atollplongee.com\/glossary\/pression-atmospherique\/"},"modified":"2021-03-10T16:07:49","modified_gmt":"2021-03-10T15:07:49","slug":"pression-atmospherique","status":"publish","type":"glossary","link":"https:\/\/www.atollplongee.com\/en\/glossary\/pression-atmospherique\/","title":{"rendered":"Pression Atmosph\u00e9rique<span class=\"dashicons\" data-icon=\"\" style=\"display:inline;vertical-align:baseline;\"><\/span>"},"content":{"rendered":"<p>&ldquo;La <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;Pression&lt;span class=&amp;quot;dashicons &amp;quot; data-icon=&amp;quot;&amp;quot; style=&amp;quot;display:inline;vertical-align:baseline;&amp;quot;&gt;&lt;\/span&gt;&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;&amp;quot;La pression est une grandeur physique qui se d&eacute;finit comme &eacute;tant l&amp;#039;intensit&eacute; de la force qu&amp;#039;exerce un gaz par unit&eacute; de surface. En plong&eacute;e sous-marine, elle permet d&amp;#039;&eacute;valuer la quantit&eacute; de gaz contenu dans un volume donn&eacute;. Elle se mesure en pascals dans le syst&egrave;me international (symbole Pa), mais se mesure plut&ocirc;t en bars en plong&eacute;e :  1bar=100000Pa=1kg\/cm2  En plong&eacute;e, on distingue plusieurs types de pression : &bull;\tLa pression absolue (ou pression ambiante, ou pression environnante),&bull;\tLa pression hydrostatique,&bull;\tla haute pression, la pression interm&eacute;diaire et la basse pression,&bull;\tLa mi-pression,&bull;\tLa notion de pression partielle&amp;quot;&lt;\/div&gt;\"  href=\"https:\/\/www.atollplongee.com\/en\/glossary\/pression\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>pression<\/a> atmosph&eacute;rique d&eacute;signe la <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;Pression&lt;span class=&amp;quot;dashicons &amp;quot; data-icon=&amp;quot;&amp;quot; style=&amp;quot;display:inline;vertical-align:baseline;&amp;quot;&gt;&lt;\/span&gt;&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;&amp;quot;La pression est une grandeur physique qui se d&eacute;finit comme &eacute;tant l&amp;#039;intensit&eacute; de la force qu&amp;#039;exerce un gaz par unit&eacute; de surface. En plong&eacute;e sous-marine, elle permet d&amp;#039;&eacute;valuer la quantit&eacute; de gaz contenu dans un volume donn&eacute;. Elle se mesure en pascals dans le syst&egrave;me international (symbole Pa), mais se mesure plut&ocirc;t en bars en plong&eacute;e :  1bar=100000Pa=1kg\/cm2  En plong&eacute;e, on distingue plusieurs types de pression : &bull;\tLa pression absolue (ou pression ambiante, ou pression environnante),&bull;\tLa pression hydrostatique,&bull;\tla haute pression, la pression interm&eacute;diaire et la basse pression,&bull;\tLa mi-pression,&bull;\tLa notion de pression partielle&amp;quot;&lt;\/div&gt;\"  href=\"https:\/\/www.atollplongee.com\/en\/glossary\/pression\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>pression<\/a> qui r&egrave;gne dans l&rsquo;atmosph&egrave;re terrestre. Elle est due au poids de la colonne d&rsquo;air se trouvant au-dessus d&rsquo;une certaine surface et vaut environ 1013 hPa (hectopascals) au niveau de la mer.<br>\nEn plong&eacute;e, une telle pr&eacute;cision dans le chiffre est superflue : on se contente en g&eacute;n&eacute;ral de retenir qu&rsquo;elle vaut environ 1 <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;Bar&lt;span class=&amp;quot;dashicons &amp;quot; data-icon=&amp;quot;&amp;quot; style=&amp;quot;display:inline;vertical-align:baseline;&amp;quot;&gt;&lt;\/span&gt;&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Le bar est une unit&eacute; de mesure de la pression qui ne fait pas partie du syst&egrave;me international, mais qui est largement utilis&eacute;e en plong&eacute;e. 1bar=100000Pa=1kg\/cm2&lt;\/div&gt;\"  href=\"https:\/\/www.atollplongee.com\/en\/glossary\/bar\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>bar<\/a> (1 <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;Bar&lt;span class=&amp;quot;dashicons &amp;quot; data-icon=&amp;quot;&amp;quot; style=&amp;quot;display:inline;vertical-align:baseline;&amp;quot;&gt;&lt;\/span&gt;&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Le bar est une unit&eacute; de mesure de la pression qui ne fait pas partie du syst&egrave;me international, mais qui est largement utilis&eacute;e en plong&eacute;e. 1bar=100000Pa=1kg\/cm2&lt;\/div&gt;\"  href=\"https:\/\/www.atollplongee.com\/en\/glossary\/bar\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>bar<\/a> = 1000 hPa).<br>\nAu niveau de la mer, la <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;Pression&lt;span class=&amp;quot;dashicons &amp;quot; data-icon=&amp;quot;&amp;quot; style=&amp;quot;display:inline;vertical-align:baseline;&amp;quot;&gt;&lt;\/span&gt;&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;&amp;quot;La pression est une grandeur physique qui se d&eacute;finit comme &eacute;tant l&amp;#039;intensit&eacute; de la force qu&amp;#039;exerce un gaz par unit&eacute; de surface. En plong&eacute;e sous-marine, elle permet d&amp;#039;&eacute;valuer la quantit&eacute; de gaz contenu dans un volume donn&eacute;. Elle se mesure en pascals dans le syst&egrave;me international (symbole Pa), mais se mesure plut&ocirc;t en bars en plong&eacute;e :  1bar=100000Pa=1kg\/cm2  En plong&eacute;e, on distingue plusieurs types de pression : &bull;\tLa pression absolue (ou pression ambiante, ou pression environnante),&bull;\tLa pression hydrostatique,&bull;\tla haute pression, la pression interm&eacute;diaire et la basse pression,&bull;\tLa mi-pression,&bull;\tLa notion de pression partielle&amp;quot;&lt;\/div&gt;\"  href=\"https:\/\/www.atollplongee.com\/en\/glossary\/pression\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>pression<\/a> atmosph&eacute;rique vaut 1,013 bars, soit aussi en unit&eacute;s moins classiques en plong&eacute;e :<br>\n&bull;\t1,033 kgf \/cm&sup2; (kilogramme-force par centim&egrave;tre carr&eacute;),<br>\n&bull;\t760 mmHg (millim&egrave;tres de mercure).&rdquo;<\/p>","protected":false},"excerpt":{"rendered":"<p>&#8220;La pression atmosph\u00e9rique d\u00e9signe la pression qui r\u00e8gne dans l&#8217;atmosph\u00e8re terrestre. Elle est due au poids de la colonne d&#8217;air se trouvant au-dessus d&#8217;une certaine surface et vaut environ 1013 hPa (hectopascals) au niveau de la mer. En plong\u00e9e, une telle pr\u00e9cision dans le chiffre est superflue : on se contente en g\u00e9n\u00e9ral de retenir [&hellip;]<\/p>","protected":false},"author":13,"featured_media":0,"menu_order":0,"template":"","meta":[],"glossary-categories":[],"glossary-tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Pression Atmosph\u00e9rique - Atoll Plong\u00e9e Marseille<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.atollplongee.com\/en\/glossary\/pression-atmospherique\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pression Atmosph\u00e9rique - Atoll Plong\u00e9e Marseille\" \/>\n<meta property=\"og:description\" content=\"&#8220;La pression atmosph\u00e9rique d\u00e9signe la pression qui r\u00e8gne dans l&#8217;atmosph\u00e8re terrestre. Elle est due au poids de la colonne d&#8217;air se trouvant au-dessus d&#8217;une certaine surface et vaut environ 1013 hPa (hectopascals) au niveau de la mer. 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