{"id":641457,"date":"2023-06-26T12:06:16","date_gmt":"2023-06-26T06:36:16","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=641457"},"modified":"2025-07-25T17:14:59","modified_gmt":"2025-07-25T11:44:59","slug":"pressure","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/articles\/pressure\/","title":{"rendered":"What is Pressure? Definition, Formula, Unit, Examples"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/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\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" 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: #999;color:#999\" 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><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/articles\/pressure\/#What_is_Pressure_-_Formula\" title=\"What is Pressure? &#8211; Formula\">What is Pressure? &#8211; Formula<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/articles\/pressure\/#Types_of_Pressure\" title=\"Types of Pressure\">Types of Pressure<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/articles\/pressure\/#Pressure_Conversion_Table\" title=\"Pressure Conversion Table\">Pressure Conversion Table<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/articles\/pressure\/#Magnitude_of_Pressure\" title=\"Magnitude of Pressure\">Magnitude of Pressure<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/infinitylearn.com\/surge\/articles\/pressure\/#Pressure_in_Fluids\" title=\"Pressure in Fluids\">Pressure in Fluids<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/infinitylearn.com\/surge\/articles\/pressure\/#Solved_examples\" title=\"Solved examples\">Solved examples<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/infinitylearn.com\/surge\/articles\/pressure\/#FAQs_On_Pressure\" title=\"FAQs On Pressure\">FAQs On Pressure<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/infinitylearn.com\/surge\/articles\/pressure\/#What_is_pressure_and_its_formula\" title=\"What is pressure and its formula?\">What is pressure and its formula?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/infinitylearn.com\/surge\/articles\/pressure\/#What_is_pressure_and_its_SI_unit\" title=\"What is pressure and its SI unit?\">What is pressure and its SI unit?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/infinitylearn.com\/surge\/articles\/pressure\/#What_is_pressure_in_a_fluid\" title=\"What is pressure in a fluid?\">What is pressure in a fluid?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p>Pressure is a fundamental concept in physics, defined as the physical force exerted on an object. This force is applied perpendicular to the surface of the object and is measured per unit area. In mathematical terms, pressure (P) is calculated as the force (F) divided by the area (A), giving us the formula P = F\/A. The standard unit of pressure is the Pascal (Pa).<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_Pressure_-_Formula\"><\/span>What is Pressure? &#8211; Formula<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Pressure is a fundamental physical concept that describes the force applied to a surface per unit area. It can be defined as the amount of force exerted on a given surface area, or simply as the ratio of force to the area over which that force is acting.<\/p>\n<p>Pressure (P) = Thrust \/ Area<\/p>\n<p>In SI units, 1 pascal (Pa) is equivalent to 1 newton per square meter (N\/m\u00b2).<\/p>\n<p>Let&#8217;s explore a practical example to better understand the concept of pressure. Imagine you have two pins, one sharp and one blunt, and you want to hammer them into a wooden surface. You might notice that it&#8217;s easier to hammer the sharp pin than the blunt one. Why is this the case?<\/p>\n<p>The key lies in the area of contact between the pin and the surface. When you use the sharp pin, the point of contact is extremely small, which means the area (A) in the<strong> pressure formula<\/strong> is minimal. On the other hand, when you use the blunt pin, the point of contact is much larger, resulting in a larger area (A).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Types_of_Pressure\"><\/span>Types of Pressure<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>There are following types of Pressure:<\/p>\n<ol>\n<li><strong>Absolute Pressure:<\/strong> This is the pressure measured relative to a perfect vacuum. It includes atmospheric pressure, making it the total pressure in a system.<\/li>\n<li><strong>Atmospheric Pressure:<\/strong> Atmospheric pressure is the pressure exerted by the weight of the air above a specific point on Earth&#8217;s surface. At sea level, it is approximately 101.3 kPa (kilopascals).<\/li>\n<li><strong>Differential Pressure:<\/strong> This type of pressure is the difference in pressure between two points in a fluid or gas system. It is often used to measure flow rates and fluid levels.<\/li>\n<li><strong>Gauge Pressure:<\/strong> Gauge pressure is the pressure relative to atmospheric pressure. When a pressure gauge reads zero, it is measuring gauge pressure, meaning it accounts for atmospheric pressure.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Pressure_Conversion_Table\"><\/span>Pressure Conversion Table<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-642238\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2023\/06\/Pressure-Conversion-Table-1.png\" alt=\"\" width=\"506\" height=\"178\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2023\/06\/Pressure-Conversion-Table-1.png 506w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2023\/06\/Pressure-Conversion-Table-1-300x106.png 300w\" sizes=\"(max-width: 506px) 100vw, 506px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Magnitude_of_Pressure\"><\/span>Magnitude of Pressure<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The magnitude of pressure depends on the force applied and the area over which it is distributed. Pressure is inversely proportional to the area on which the thrust is applied. It means that if the thrust is constant and the area is more, the pressure will be lesser. And if the area is less, the pressure will be more.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-641537\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2023\/06\/Magnitude-of-Pressure.png\" alt=\"Magnitude of Pressure\" width=\"245\" height=\"240\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Pressure_in_Fluids\"><\/span>Pressure in Fluids<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In fluids (liquids and gases), pressure is transmitted equally in all directions. This is known as Pascal&#8217;s principle. In a fluid at rest, pressure increases with depth due to the weight of the fluid above it. This is expressed by the equation:<\/p>\n<p><strong>Pressure = Density \u00d7 Gravity \u00d7 Height<\/strong><\/p>\n<p>Where Density is the density of the fluid, Gravity is the acceleration due to gravity, and Height is the vertical distance from the surface.<\/p>\n<p>Understanding pressure is crucial for many scientific and practical applications. It allows us to comprehend the behaviour of fluids, design effective systems, and evaluate the impact of pressure on structures and human health. Whether it&#8217;s exploring the depths of the ocean, predicting the weather, or maintaining our well-being, pressure is a concept that influences our understanding of the physical world around us.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Solved_examples\"><\/span>Solved examples<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Example 1: A force of 500 Newton is applied to a circular surface with a diameter of 0.2 meters. Calculate the pressure exerted on the surface.<\/strong><\/p>\n<p><strong>Solution:<\/strong> Given<\/p>\n<p>Force = 500 N<\/p>\n<p>Diameter = 0.2 m<\/p>\n<p><strong>Step 1:<\/strong> Calculate the area of the circular surface.<\/p>\n<p>Area = \u03c0 \u00d7 (radius)<sup>2<\/sup><\/p>\n<p>Radius = Diameter \/ 2 = 0.2 m \/ 2 = 0.1 m<\/p>\n<p>Area = \u03c0 \u00d7 (0.1 m)<sup>2<\/sup> = 0.0314 m\u00b2<\/p>\n<p><strong>Step 2:<\/strong> Calculate the pressure.<\/p>\n<p>Pressure = Force \/ Area<\/p>\n<p>Pressure = 500 N \/ 0.0314 m\u00b2 \u2248 15,923.57 Pa<\/p>\n<p>Therefore, the pressure exerted on the surface is approximately 15,923.57 Pascal (Pa).<\/p>\n<p>Example 2: A block of wood is kept on a table. The mass of the wooden block is 500 grams and its dimensions are 5 cm \u00d7 3cm \u00d7 2 cm. Let us find the thrust and pressure exerted by it on the table if it is made to lie on it with its sides of dimensions (A) 5 cm \u00d7 3 cm and (B) 3 cm \u00d7 2 cm.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-641562\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2023\/06\/block-of-wood.png\" alt=\"block of wood\" width=\"431\" height=\"164\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2023\/06\/block-of-wood.png?v=1687756419 431w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2023\/06\/block-of-wood-300x114.png?v=1687756419 300w\" sizes=\"(max-width: 431px) 100vw, 431px\" \/><\/p>\n<p><strong>Solutions:<\/strong><\/p>\n<p>Let us find the thrust and pressure exerted by the block on the table in each of the cases.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone wp-image-641575\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2023\/06\/block-of-woods.png\" alt=\"block of woods\" width=\"400\" height=\"160\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2023\/06\/block-of-woods.png?v=1687756506 327w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2023\/06\/block-of-woods-300x120.png?v=1687756506 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/p>\n<p><strong>Thrust calculation<\/strong><\/p>\n<p>The weight of the wooden block applies a thrust on the table. Since the weight of the box is the same in both the cases the value of thrust will also be the same. The thrust can be <strong>calculated<\/strong> as follows,<\/p>\n<p><strong>\ud835\udc47\u210e\ud835\udc5f\ud835\udc62\ud835\udc60\ud835\udc61 = \ud835\udc39 = \ud835\udc5a \u00d7 \ud835\udc54<\/strong><\/p>\n<p>Where, \u2018m\u2019 is the mass of the block and \u2018g\u2019 is the acceleration due to gravity. The mass \u2018m\u2019 is 500 grams, which is equivalent to 0.5 kilograms and \u2018g\u2019 is 9.8 m\/s<sup>2<\/sup>.<\/p>\n<p>Thrust = F = m x g<\/p>\n<p>= 0.5kg x 9.8m\/s<sup>2<\/sup><\/p>\n<p>= 4.9 Newtons<\/p>\n<p><strong>Pressure calculation:<\/strong><\/p>\n<p>We can calculate the pressure in both the cars using the pressure formula,<\/p>\n<p>Pressure = Thrust\/Area<\/p>\n<p>In case A, the area of the box in contact with the table is,<\/p>\n<p>Area = 5cm x 3cm<\/p>\n<p>= 15cm<sup>2<\/sup> or 0.0015m<sup>2<\/sup><\/p>\n<p>Pressure = 4.9N\/0.0015M<sup>2<\/sup><\/p>\n<p>= 3266.66 N.m<sup>2<\/sup><\/p>\n<p>We can also calculate the pressure in case B as follows:<\/p>\n<p>Thrust = F = 0.5 x 9.8m\/s<sup>2<\/sup><\/p>\n<p>= 4.9N<\/p>\n<p>Area = 3cm x 2cm<\/p>\n<p>= 6cm<sup>2<\/sup><\/p>\n<p>= 0.0006 m<sup>2<\/sup><\/p>\n<p>Pressure = 4.9N\/0.0006m<sup>2<\/sup><\/p>\n<p>= 8166.66 N\/m<sup>2<\/sup><\/p>\n<p>Hence, the pressure in case B is much more than that in case A. This is because the area of contact is lesser in case B.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs_On_Pressure\"><\/span>FAQs On Pressure<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_is_pressure_and_its_formula\"><\/span>What is pressure and its formula?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tPressure is the force applied on an object divided by the area over which it is applied. The formula for pressure is: Pressure (P) = Force (F) \/ Area (A).\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_is_pressure_and_its_SI_unit\"><\/span>What is pressure and its SI unit?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tPressure is the measure of how strongly a force is distributed over a given area. Its SI (International System of Units) unit is called the Pascal (Pa). So, pressure is measured in Pascals.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_is_pressure_in_a_fluid\"><\/span>What is pressure in a fluid?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tPressure in a fluid refers to the force that the liquid or gas exerts on the walls of its container or any object submerged in it. It happens because the particles in the fluid are constantly moving and bumping into things, creating a push or pressure in all directions.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\n<script type=\"application\/ld+json\">\n\t{\n\t\t\"@context\": \"https:\/\/schema.org\",\n\t\t\"@type\": \"FAQPage\",\n\t\t\"mainEntity\": [\n\t\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What is pressure and its formula?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Pressure is the force applied on an object divided by the area over which it is applied. The formula for pressure is: Pressure (P) = Force (F) \/ Area (A).\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What is pressure and its SI unit?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Pressure is the measure of how strongly a force is distributed over a given area. Its SI (International System of Units) unit is called the Pascal (Pa). So, pressure is measured in Pascals.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What is pressure in a fluid?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Pressure in a fluid refers to the force that the liquid or gas exerts on the walls of its container or any object submerged in it. It happens because the particles in the fluid are constantly moving and bumping into things, creating a push or pressure in all directions.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t\t\t\t]\n\t}\n<\/script>\n\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pressure is a fundamental concept in physics, defined as the physical force exerted on an object. This force is applied [&hellip;]<\/p>\n","protected":false},"author":52,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Pressure formula","_yoast_wpseo_title":"What is Pressure? Definition, Formula - Infinity Learn","_yoast_wpseo_metadesc":"Pressure is defined as the physical force exerted on an object. The basic formula for pressure is F\/A. 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