{"id":9262,"date":"2026-10-23T22:42:58","date_gmt":"2026-10-23T15:42:58","guid":{"rendered":"https:\/\/copperbandscuba.com\/index.php\/boyles-law-scuba-diving\/"},"modified":"2026-10-24T00:38:05","modified_gmt":"2026-10-23T17:38:05","slug":"boyles-law-scuba-diving","status":"publish","type":"page","link":"https:\/\/copperbandscuba.com\/index.php\/boyles-law-scuba-diving\/","title":{"rendered":"Boyle\u2019s Law for Divers: Pressure, Volume and Depth"},"content":{"rendered":"<nav class=\"cb-site-nav\" aria-label=\"Main navigation\"><div class=\"cb-nav-wrap\"><a class=\"cb-nav-logo\" href=\"https:\/\/copperbandscuba.com\/\" aria-label=\"Copperband home\"><img loading=\"lazy\" decoding=\"async\" width=\"112\" height=\"100\" src=\"https:\/\/copperbandscuba.com\/wp-content\/uploads\/2024\/07\/Copperband-logo-just-fish-curved-Dive-Centre-ORANGE-letter-1-300x266.png\" alt=\"Copperband Scuba Academy\"><\/a><button class=\"cb-nav-toggle\" type=\"button\" aria-expanded=\"false\" aria-controls=\"cb-review-menu\">Menu<\/button><div class=\"cb-nav-items\" id=\"cb-review-menu\"><a href=\"https:\/\/copperbandscuba.com\/\">Home<\/a><a href=\"https:\/\/copperbandscuba.com\/index.php\/try-scuba-diving\/\">Diving<\/a><a href=\"https:\/\/copperbandscuba.com\/index.php\/services\/\">PADI courses<\/a><a href=\"https:\/\/copperbandscuba.com\/index.php\/shop\/\">Equipment Shop<\/a><a href=\"https:\/\/copperbandscuba.com\/index.php\/pattaya-dive-sites\/\">Dive sites<\/a><a href=\"https:\/\/copperbandscuba.com\/index.php\/contact-us\/\">Contact &amp; location<\/a><a class=\"cb-education-link\" href=\"https:\/\/copperbandscuba.com\/index.php\/education-hub\/\">Education Hub<\/a><a class=\"cb-nav-book\" href=\"https:\/\/copperbandscuba.com\/#booking-enquiry\">Book your dive<\/a><\/div><\/div><\/nav>\n\n<div class=\"edu\"><header class=\"edu-hero\"><div class=\"edu-wrap\"><nav aria-label=\"Breadcrumb\"><a href=\"https:\/\/copperbandscuba.com\/\">Home<\/a> \/ <a href=\"https:\/\/copperbandscuba.com\/index.php\/education-hub\/\">Education Hub<\/a> \/ Physics and physiology<\/nav><p class=\"edu-kicker\">Physics and physiology \u00b7 Lesson 10<\/p><h1>Boyle\u2019s Law for Divers: Pressure, Volume and Depth<\/h1><p class=\"edu-lead\">Boyle\u2019s law connects pressure with gas volume. It explains why flexible air spaces change as you descend or ascend, and why the shallow part of a dive deserves careful control.<\/p><p class=\"edu-byline\">Copperband Scuba Academy \u00b7 Educational guide \u00b7 Published 23 October 2026<\/p><\/div><\/header><article class=\"edu-reading\"><aside class=\"edu-notice\" aria-label=\"Educational disclaimer\"><strong>Educational information only.<\/strong> This information does not replace official training, practical instruction or certification through a recognised scuba diving organisation such as PADI. Always dive within your qualifications, experience and current conditions.<\/aside><div class=\"edu-visual-slot\"><section class=\"edu-visuals\" id=\"learning-sheet\" aria-labelledby=\"learning-sheet-title\"><header class=\"edu-sheet-heading\"><div><p class=\"edu-kicker\">Copperband learning sheet<\/p><h2 id=\"learning-sheet-title\">Pressure up. Flexible gas volume down.<\/h2><\/div><button type=\"button\" class=\"edu-print-sheet\">Print learning sheet<\/button><\/header><p class=\"edu-visual-intro\">Fixed gas amount, constant temperature: P\u2081V\u2081 = P\u2082V\u2082.<\/p><figure class=\"edu-infographic\"><div class=\"edu-svg-wrap\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 780 365\" role=\"img\" aria-labelledby=\"visual-title-boyle visual-desc-boyle\"><title id=\"visual-title-boyle\">Pressure up. Flexible gas volume down.<\/title><desc id=\"visual-desc-boyle\">Fixed gas amount, constant temperature: P\u2081V\u2081 = P\u2082V\u2082. Surface: 1 bar absolute \u00b7 6 litres. 10 metres: 2 bar absolute \u00b7 3 litres. 20 metres: 3 bar absolute \u00b7 2 litres<\/desc><defs><marker id=\"arrow-boyle\" markerWidth=\"8\" markerHeight=\"8\" refX=\"6\" refY=\"3\" orient=\"auto\"><path d=\"M0,0 L0,6 L6,3Z\" fill=\"#e7b545\"\/><\/marker><\/defs><rect width=\"780\" height=\"365\" rx=\"14\" fill=\"#16272b\"\/><rect x=\"25\" y=\"24\" width=\"210\" height=\"290\" rx=\"14\" fill=\"#23383c\" stroke=\"#537176\"\/><text x=\"128\" y=\"64\" fill=\"#fff\" font-size=\"22\" font-family=\"Arial,sans-serif\" text-anchor=\"middle\">Surface<\/text><circle cx=\"128\" cy=\"147\" r=\"57\" fill=\"#2c7277\" stroke=\"#e7b545\" stroke-width=\"2\"\/><text x=\"128\" y=\"245\" fill=\"#d6e0dd\" font-size=\"18\" font-family=\"Arial,sans-serif\" text-anchor=\"middle\">1 bar absolute<\/text><text x=\"128\" y=\"278\" fill=\"#e7b545\" font-size=\"25\" font-family=\"Arial,sans-serif\" text-anchor=\"middle\">6 litres<\/text><rect x=\"275\" y=\"24\" width=\"210\" height=\"290\" rx=\"14\" fill=\"#23383c\" stroke=\"#537176\"\/><text x=\"378\" y=\"64\" fill=\"#fff\" font-size=\"22\" font-family=\"Arial,sans-serif\" text-anchor=\"middle\">10 metres<\/text><circle cx=\"378\" cy=\"147\" r=\"45.240929981093686\" fill=\"#2c7277\" stroke=\"#e7b545\" stroke-width=\"2\"\/><text x=\"378\" y=\"245\" fill=\"#d6e0dd\" font-size=\"18\" font-family=\"Arial,sans-serif\" text-anchor=\"middle\">2 bar absolute<\/text><text x=\"378\" y=\"278\" fill=\"#e7b545\" font-size=\"25\" font-family=\"Arial,sans-serif\" text-anchor=\"middle\">3 litres<\/text><rect x=\"525\" y=\"24\" width=\"210\" height=\"290\" rx=\"14\" fill=\"#23383c\" stroke=\"#537176\"\/><text x=\"628\" y=\"64\" fill=\"#fff\" font-size=\"22\" font-family=\"Arial,sans-serif\" text-anchor=\"middle\">20 metres<\/text><circle cx=\"628\" cy=\"147\" r=\"39.521592637986174\" fill=\"#2c7277\" stroke=\"#e7b545\" stroke-width=\"2\"\/><text x=\"628\" y=\"245\" fill=\"#d6e0dd\" font-size=\"18\" font-family=\"Arial,sans-serif\" text-anchor=\"middle\">3 bar absolute<\/text><text x=\"628\" y=\"278\" fill=\"#e7b545\" font-size=\"25\" font-family=\"Arial,sans-serif\" text-anchor=\"middle\">2 litres<\/text><text x=\"380\" y=\"345\" fill=\"#bccdcb\" font-size=\"16\" font-family=\"Arial,sans-serif\" text-anchor=\"middle\">Same gas amount \u00b7 Constant temperature \u00b7 Approximate seawater pressure<\/text><\/svg><\/div><figcaption>Surface: 1 bar absolute \u00b7 6 litres \u2022 10 metres: 2 bar absolute \u00b7 3 litres \u2022 20 metres: 3 bar absolute \u00b7 2 litres.<\/figcaption><\/figure><div class=\"edu-logic-sheet\"><h3>Logic sheet: connect the idea with the decision<\/h3><p>Use these prompts to check your understanding before discussing practical decisions with your instructor.<\/p><div class=\"edu-logic-grid\"><div class=\"edu-logic-row\"><div class=\"edu-logic-context\"><span class=\"edu-logic-number\">01<\/span><strong>Choose the pressure<\/strong><\/div><div><span class=\"edu-cell-label\">Consider<\/span>Is it absolute pressure?<\/div><div><span class=\"edu-cell-label\">Next step<\/span>Include atmospheric pressure; do not substitute gauge pressure.<\/div><\/div><div class=\"edu-logic-row\"><div class=\"edu-logic-context\"><span class=\"edu-logic-number\">02<\/span><strong>Check assumptions<\/strong><\/div><div><span class=\"edu-cell-label\">Consider<\/span>Fixed gas amount, constant temperature and flexible space?<\/div><div><span class=\"edu-cell-label\">Next step<\/span>Only apply this simple model where those assumptions fit.<\/div><\/div><div class=\"edu-logic-row\"><div class=\"edu-logic-context\"><span class=\"edu-logic-number\">03<\/span><strong>Calculate the example<\/strong><\/div><div><span class=\"edu-cell-label\">Consider<\/span>Pressure doubles from 1 to 2 bar?<\/div><div><span class=\"edu-cell-label\">Next step<\/span>The illustrative volume halves from 6 to 3 litres.<\/div><\/div><div class=\"edu-logic-row\"><div class=\"edu-logic-context\"><span class=\"edu-logic-number\">04<\/span><strong>Apply the insight<\/strong><\/div><div><span class=\"edu-cell-label\">Consider<\/span>Using the equation to plan a whole dive?<\/div><div><span class=\"edu-cell-label\">Next step<\/span>Stop: it does not calculate decompression, reserves or medical suitability.<\/div><\/div><\/div><\/div><p class=\"edu-takeaway\"><strong>Remember:<\/strong> Approximate seawater model. The example is not a sealed-lung model or a target diving depth.<\/p><p class=\"edu-sheet-disclaimer\"><strong>Educational information only.<\/strong> This sheet does not replace official training, practical instruction or certification through a recognised scuba diving organisation such as PADI. It is not an emergency protocol, personal medical assessment or technical dive plan.<\/p><\/section><\/div><nav class=\"edu-toc\" aria-label=\"Lesson contents\"><strong>In this lesson<\/strong><ul><li><a href=\"#learning-sheet\">Infographic and logic sheet<\/a><\/li><li><a href=\"#topic-0\">Use absolute pressure<\/a><\/li><li><a href=\"#topic-1\">The relationship<\/a><\/li><li><a href=\"#topic-2\">Connect the formula with diving<\/a><\/li><li><a href=\"#deeper\">Learn more: compare equal depth changes<\/a><\/li><li><a href=\"#self-check\">Check your understanding<\/a><\/li><\/ul><\/nav><section id=\"topic-0\"><h2>Use absolute pressure<\/h2><p>Absolute pressure includes atmospheric pressure as well as the pressure of the water. For a simplified seawater example, use approximately 1 bar at the surface and add approximately 1 bar for every 10 metres of depth. Actual water density and atmospheric conditions vary.<\/p><p>At 10 metres this model gives 2 bar absolute, not 1 bar absolute. Confusing gauge pressure with absolute pressure produces incorrect gas-law calculations. State your units and assumptions before substituting numbers.<\/p><\/section><section id=\"topic-1\"><h2>The relationship<\/h2><p>For a fixed amount of ideal gas at constant temperature, pressure multiplied by volume remains constant: P1 \u00d7 V1 = P2 \u00d7 V2. If pressure doubles, the volume halves. If pressure halves, the volume doubles.<\/p><p>Imagine a flexible sealed gas space of 6 litres at the surface. At 2 bar absolute, its theoretical volume is 3 litres: 1 \u00d7 6 \u00f7 2. At 3 bar absolute it is 2 litres. This is a simplified illustration, not a model of a freely breathing diver\u2019s lungs or a personal buoyancy instruction.<\/p><\/section><section id=\"topic-2\"><h2>Connect the formula with diving<\/h2><p>Gas in a flexible BCD space changes volume as ambient pressure changes. A mask and middle ears need appropriate equalisation. Gas supplied by a regulator can expand on ascent, which helps explain why breath-holding on scuba is dangerous.<\/p><p>Different systems have different constraints. A rigid cylinder does not simply shrink to half its physical size at depth. An open, breathing respiratory system is not a sealed balloon. The equation is useful only when its assumptions describe the situation.<\/p><\/section><section class=\"edu-deeper\" id=\"deeper\"><p class=\"edu-kicker\">Go a little deeper<\/p><h2>compare equal depth changes<\/h2><p>Using the same model, travelling from 10 metres to the surface changes pressure from 2 to 1 bar, so a sealed flexible gas space doubles in volume. Travelling from 20 to 10 metres changes pressure from 3 to 2 bar, so volume increases by a factor of 1.5. Equal depth changes therefore do not create equal proportional volume changes. This explains the importance of controlled shallow-water ascents and buoyancy practice, without prescribing an ascent procedure.<\/p><table><caption>Illustrative sealed gas space: 6 litres at the surface, constant temperature<\/caption><thead><tr><th>Depth<\/th><th>Approximate absolute pressure<\/th><th>Gas volume<\/th><\/tr><\/thead><tbody><tr><td>Surface<\/td><td>1 bar<\/td><td>6 litres<\/td><\/tr><tr><td>10 m<\/td><td>2 bar<\/td><td>3 litres<\/td><\/tr><tr><td>20 m<\/td><td>3 bar<\/td><td>2 litres<\/td><\/tr><\/tbody><\/table><\/section><section id=\"self-check\" class=\"edu-check\"><h2>Check your understanding<\/h2><h3>Does Boyle\u2019s law alone calculate a safe dive?<\/h3><p>No. It explains a pressure\u2013volume relationship under stated assumptions. It does not calculate decompression, gas reserves, personal medical suitability or safe operating procedures.<\/p><\/section><section><h2>Connect theory with training<\/h2><ul><li><a href=\"https:\/\/copperbandscuba.com\/index.php\/services\/open-water-course\/\">Study pressure in Open Water training<\/a><\/li><li><a href=\"https:\/\/copperbandscuba.com\/index.php\/services\/peak-performance-buoyancy\/\">Practise buoyancy with an instructor<\/a><\/li><\/ul><p>For a Pattaya trip, tell the team your qualification, last-dive date and learning goals so the practical programme can be matched to you.<\/p><\/section><nav class=\"edu-next\" aria-label=\"Continue learning\"><h2>Continue learning<\/h2><ul><li><a href=\"https:\/\/copperbandscuba.com\/index.php\/ear-equalisation-scuba-diving\/\">Ear Equalisation for Scuba Diving: Pressure and Comfort<\/a><\/li><li><a href=\"https:\/\/copperbandscuba.com\/index.php\/scuba-buoyancy-trim-theory\/\">Scuba Buoyancy and Trim: Why Divers Rise or Sink<\/a><\/li><li><a href=\"https:\/\/copperbandscuba.com\/index.php\/daltons-henrys-laws-diving\/\">Dalton\u2019s and Henry\u2019s Laws: Breathing Gases and Decompression<\/a><\/li><\/ul><a href=\"https:\/\/copperbandscuba.com\/index.php\/education-hub\/#physics-and-physiology\">Back to Physics and physiology<\/a><\/nav><section class=\"edu-sources\"><h2>Sources and further reading<\/h2><ul><li><a href=\"https:\/\/blog.padi.com\/diving-physics\/\" rel=\"noopener\" target=\"_blank\">PADI: the physics behind diving<\/a><\/li><\/ul><p>This is an independently written educational guide, not an official PADI course manual or certification assessment. Ask your instructor about unclear concepts before applying them in the water.<\/p><\/section><aside class=\"edu-notice\" aria-label=\"Educational disclaimer\"><strong>Educational information only.<\/strong> This information does not replace official training, practical instruction or certification through a recognised scuba diving organisation such as PADI. 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It explains why flexible air spaces change as you descend or ascend, and why the shallow part of a dive deserves careful control.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-9262","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Boyle\u2019s Law for Scuba Divers | Copperband<\/title>\n<meta name=\"description\" content=\"Understand absolute pressure and Boyle\u2019s law with simple worked examples, a depth-and-volume table, and links to buoyancy and equalisation.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/copperbandscuba.com\/index.php\/boyles-law-scuba-diving\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Boyle\u2019s Law for Scuba Divers | Copperband\" \/>\n<meta property=\"og:description\" content=\"Understand absolute pressure and Boyle\u2019s law with simple worked examples, a depth-and-volume table, and links to buoyancy and equalisation.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/copperbandscuba.com\/index.php\/boyles-law-scuba-diving\/\" \/>\n<meta property=\"og:site_name\" content=\"Copperband Scuba Academy\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/profile.php?id=61561139056724\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-23T17:38:05+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/copperbandscuba.com\/wp-content\/uploads\/2025\/08\/20250218_125339-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"2560\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Boyle\u2019s Law for Scuba Divers | Copperband\" \/>\n<meta name=\"twitter:description\" content=\"Understand absolute pressure and Boyle\u2019s law with simple worked examples, a depth-and-volume table, and links to buoyancy and equalisation.\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/copperbandscuba.com\\\/index.php\\\/boyles-law-scuba-diving\\\/\",\"url\":\"https:\\\/\\\/copperbandscuba.com\\\/index.php\\\/boyles-law-scuba-diving\\\/\",\"name\":\"Boyle\u2019s Law for Scuba Divers | Copperband\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/copperbandscuba.com\\\/#website\"},\"datePublished\":\"2026-10-23T15:42:58+00:00\",\"dateModified\":\"2026-10-23T17:38:05+00:00\",\"description\":\"Understand absolute pressure and Boyle\u2019s law with simple worked examples, a depth-and-volume table, and links to buoyancy and equalisation.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/copperbandscuba.com\\\/index.php\\\/boyles-law-scuba-diving\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/copperbandscuba.com\\\/index.php\\\/boyles-law-scuba-diving\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/copperbandscuba.com\\\/index.php\\\/boyles-law-scuba-diving\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/copperbandscuba.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Boyle\u2019s Law for Divers: Pressure, Volume and Depth\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/copperbandscuba.com\\\/#website\",\"url\":\"https:\\\/\\\/copperbandscuba.com\\\/\",\"name\":\"Copperband Scuba Academy - A Pattaya Dive Centre\",\"description\":\"PADI &amp; 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