{"id":137509,"date":"2024-09-12T19:42:40","date_gmt":"2024-09-12T19:42:40","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=137509"},"modified":"2024-09-12T19:42:41","modified_gmt":"2024-09-12T19:42:41","slug":"in-a-phase-diagram","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2024\/09\/12\/in-a-phase-diagram\/","title":{"rendered":"In a phase diagram"},"content":{"rendered":"\n<p>In a phase diagram, which of the following is the term used for a substance held at a temperature and pressure where the solid, liquid, and gaseous states of a substance exist simultaneously?<\/p>\n\n\n\n<p>A.<br>Triple point.<\/p>\n\n\n\n<p>B.<br>Critical temperature.<\/p>\n\n\n\n<p>C.<br>Critical point.<\/p>\n\n\n\n<p>D.<br>Absolute zero.<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The correct answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>The correct answer is <strong>A. Triple point<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>The <strong>triple point<\/strong> of a substance is the specific combination of temperature and pressure at which the three phases of matter\u2014solid, liquid, and gas\u2014can coexist in thermodynamic equilibrium. It is a unique point in a phase diagram, and each substance has its own distinct triple point.<\/p>\n\n\n\n<p>In a typical phase diagram, which plots pressure against temperature, the phase boundaries between solid, liquid, and gas are depicted. These boundaries represent the conditions under which two phases (such as solid and liquid, or liquid and gas) coexist. The triple point is where all three phases converge, and it&#8217;s the only condition where the solid, liquid, and gaseous states of a substance exist simultaneously.<\/p>\n\n\n\n<p>For example, the triple point of water occurs at a temperature of <strong>0.01\u00b0C (273.16 K)<\/strong> and a pressure of <strong>611.657 pascals<\/strong>. At this specific point, ice, liquid water, and water vapor can coexist in equilibrium.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why the Other Choices are Incorrect:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>B. Critical temperature<\/strong>: This refers to the temperature above which a gas cannot be liquefied, no matter how much pressure is applied. It&#8217;s part of the critical point but is unrelated to the coexistence of all three phases.<\/li>\n\n\n\n<li><strong>C. Critical point<\/strong>: This is a distinct point in a phase diagram where the liquid and gas phases become indistinguishable, but it does not involve the solid phase and does not refer to the coexistence of all three phases.<\/li>\n\n\n\n<li><strong>D. Absolute zero<\/strong>: This is the theoretical temperature (0 K or -273.15\u00b0C) at which all molecular motion stops, but it has no direct connection to the coexistence of solid, liquid, and gas phases.<\/li>\n<\/ul>\n\n\n\n<p>Thus, the triple point is the key concept describing the simultaneous presence of all three phases.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In a phase diagram, which of the following is the term used for a substance held at a temperature and pressure where the solid, liquid, and gaseous states of a substance exist simultaneously? A.Triple point. B.Critical temperature. C.Critical point. D.Absolute zero. The correct answer and Explanation is : The correct answer is A. Triple point. 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