{"id":252504,"date":"2025-07-11T10:36:18","date_gmt":"2025-07-11T10:36:18","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=252504"},"modified":"2025-07-11T10:36:28","modified_gmt":"2025-07-11T10:36:28","slug":"mass-per-unit-volume-is-called-of-a-substance","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/11\/mass-per-unit-volume-is-called-of-a-substance\/","title":{"rendered":"Mass per unit volume is called \u2026.. of a substance"},"content":{"rendered":"\n<p>Mass per unit volume is called \u2026.. of a substance. A. Specific Gravity B. Density C. Gravity D. None of these<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>The correct answer is <strong>B. Density<\/strong>.<\/p>\n\n\n\n<p><strong>Density<\/strong> is defined as the mass per unit volume of a substance. It is a fundamental physical property that describes how much mass is contained in a given volume. Mathematically, density (\u03c1) is expressed as: \u03c1=mV\\rho = \\frac{m}{V}\u03c1=Vm\u200b<\/p>\n\n\n\n<p>Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u03c1\\rho\u03c1 is the density,<\/li>\n\n\n\n<li>mmm is the mass, and<\/li>\n\n\n\n<li>VVV is the volume.<\/li>\n<\/ul>\n\n\n\n<p>The unit of density in the International System of Units (SI) is kilograms per cubic meter (kg\/m\u00b3), though in practical contexts, it can also be expressed in grams per cubic centimeter (g\/cm\u00b3).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Importance of Density:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Identification of Materials<\/strong>: Density helps in identifying substances, as each material has its own unique density. For example, lead is denser than aluminum, which is why a lead object feels heavier for its size.<\/li>\n\n\n\n<li><strong>Buoyancy<\/strong>: The density of an object plays a crucial role in determining whether it will float or sink when placed in a fluid. An object will float in a fluid if its density is less than the density of the fluid. For instance, oil floats on water because oil has a lower density than water.<\/li>\n\n\n\n<li><strong>Temperature and Pressure Effects<\/strong>: The density of most substances changes with temperature and pressure. For example, when a gas is heated, its molecules spread apart, causing its density to decrease. Similarly, when a gas is compressed, its density increases.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Other Choices:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Specific Gravity (A)<\/strong>: This is a ratio of the density of a substance to the density of a reference substance (usually water). It does not have units because it is a dimensionless quantity. Specific gravity is used to compare the relative densities of substances.<\/li>\n\n\n\n<li><strong>Gravity (C)<\/strong>: This refers to the force that attracts objects towards the center of the Earth or other celestial bodies. It is not related to mass per unit volume.<\/li>\n<\/ul>\n\n\n\n<p>Thus, <strong>density<\/strong> is the correct term to describe the mass per unit volume of a substance.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/07\/learnexams-banner6-247.jpeg\" alt=\"\" class=\"wp-image-252510\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Mass per unit volume is called \u2026.. of a substance. A. Specific Gravity B. Density C. Gravity D. None of these The Correct Answer and Explanation is: The correct answer is B. Density. Density is defined as the mass per unit volume of a substance. It is a fundamental physical property that describes how much [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","ast-disable-related-posts":"","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":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-252504","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/252504","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=252504"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/252504\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=252504"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=252504"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=252504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}