[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-665341-105":59,"doc-detail-665341-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","phase-diagrams-301-phase-diagrams","Phase Diagrams - 30.1 Phase Diagrams","","Phase diagrams summarize how temperature and pressure determine whether a substance exists as a solid, liquid, or gas. The intersection of key phase-transition curves defines the triple point, while the end of the liquid–gas curve marks the critical point where liquid cannot exist. The section explains how phase diagrams are constructed and used to find stable phases, describe phase transitions, and interpret special regions such as supercritical fluids, using examples including water.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/phase-diagrams-301-phase-diagrams/665341/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/phase-diagrams-301-phase-diagrams/665341.png","ImageObject",300,407,{"name":92,"@type":93},"dhado","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-29",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What do phase diagrams show about a substance?","Question",{"text":112,"@type":113},"Phase diagrams graph temperature and pressure regions where a substance exists as solid, liquid, or gas. They also show how phase-transition temperatures depend on pressure, including melting, sublimation, and boiling points.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How are the triple point and critical point defined on a phase diagram?",{"text":117,"@type":113},"The triple point is where three phase-transition curves intersect, giving the temperature and pressure where three phases coexist in equilibrium. The critical point is the terminus of the liquid–gas curve, above which a liquid phase cannot exist regardless of pressure.",{"name":119,"@type":110,"acceptedAnswer":120},"How does the phase diagram help determine water’s state at given conditions?",{"text":121,"@type":113},"By locating the pressure–temperature pair on the diagram, you can identify the corresponding region. For example, 50 kPa and −10 °C fall in the “ice” region, 50 kPa and 50 °C fall in the “water” region, and 25 kPa and 200 °C fall in the gaseous region.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},665341,1793298840,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":129,"read_time":144},5909893218464,"https://ap-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","30  \nPhase Diagrams  \nRelationships Pressure Phase Diagrams  \nThe temperature and pressure conditions at which a substance exists in solid, liquid, and gaseous states are summarized in a phase diagram for that substance. Phase diagrams are combined plots of pressuretemperature equilibrium curves representing the relationships between phase transition temperatures and pressures. The point of intersection of any three curves in a phase diagram represents a substance ’s triple point—the temperature and pressure at which three different phases are in equilibrium. At pressures below a solidliquid-gas triple point, a substance cannot exist in the liquid state, regardless of its temperature. The terminus of the liquid-gas curve represents the substance ’s critical point, the pressure and temperature above which a liquid phase cannot exist.  \n30.1 Phase Diagrams  \n\n| |  |\n| --- | --- |\n| By the end of this section, you will be able to: |  |\n|  Explain the construction and use of a typical phase diagram\u003Cbr> Use phase diagrams to identify stable phases at given temperatures and pressures, and to describe phase transitions resulting from changes in these properties\u003Cbr> Describe the supercritical fluid phase of matter | |\n\nIn the previous module, the variation of a liquid’s equilibrium vapor pressure with temperature was described. Considering the definition of boiling point, plots of vapor pressure versus temperature represent how the boiling point of the liquid varies with pressure. Also described was the use of heating and cooling curves to determine a substance’smelting (or freezing) point. Making such measurements over a wide range of pressures yields data that may be presented graphically as a phase diagram. A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature, and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points) . A typical phase diagram for a pure substance is shown in Figure 30.1.  \nFigure 30.1  \nThe physical state of a substance and its phase-transition temperatures are represented graphically in a phase diagram.  \nTo illustrate the utility of these plots, consider the phase diagram for water shown in Figure 30.2.  \nFigure 30.2  \nThe pressure and temperature axes on this phase diagram of water are not drawn to constant scale in order to illustrate several important properties.  \nWe can use the phase diagram to identify the physical state of a sample of water under specified conditions of pressure and temperature. For example, a pressure of 50 kPa and a temperature of −10 °C correspond to the region of the diagram labeled “ice.” Under these conditions, water exists only as a solid (ice) . A pressure of 50 kPa and a temperature of 50 °C correspond to the “water” region—here, water exists only as a liquid. At 25 kPa and 200 °C, water exists only in the gaseous state. Note that on the H2O phase diagram, the pressure and temperature axes are not drawn to a constant scale in order to permit the illustration of several important features as described here.  \nThe curve BC in Figure 30.2 is the plot of vapor pressure versus temperature as described in the previous module of this chapter. This “liquid-vapor” curve separates the liquid and gaseous regions of the phase diagram and provides the boiling point for water at any pressure. For example, at 1 atm, the boiling point is 100 °C. Notice that the liquid-vapor curve terminates at a temperature of 374 °C and a pressure of 218 atm, indicating that water cannot exist as a liquid above this temperature, regardless of the pressure. The physical properties of water under these conditions are intermediate between those of its liquid and gaseous phases. This unique state of matter is called a supercritical fluid, a to","cbCain3XALmiesb7","https://ap.wps.com/l/cbCain3XALmiesb7","pdf",1335253,14,"English","# 30 Phase Diagrams\n## 30.1 Phase Diagrams","[{\"question\":\"What do phase diagrams show about a substance?\",\"answer\":\"Phase diagrams graph temperature and pressure regions where a substance exists as solid, liquid, or gas. They also show how phase-transition temperatures depend on pressure, including melting, sublimation, and boiling points.\"},{\"question\":\"How are the triple point and critical point defined on a phase diagram?\",\"answer\":\"The triple point is where three phase-transition curves intersect, giving the temperature and pressure where three phases coexist in equilibrium. The critical point is the terminus of the liquid–gas curve, above which a liquid phase cannot exist regardless of pressure.\"},{\"question\":\"How does the phase diagram help determine water’s state at given conditions?\",\"answer\":\"By locating the pressure–temperature pair on the diagram, you can identify the corresponding region. For example, 50 kPa and −10 °C fall in the “ice” region, 50 kPa and 50 °C fall in the “water” region, and 25 kPa and 200 °C fall in the gaseous region.\"}]","Phase Diagrams - 30.1 Phase Diagrams | PDF",35]