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Rajasekhar1961 (చర్చ | రచనలు) కొత్త పేజీ: {{మొలక}} '''బాష్పీభవన స్థానం''' (Boiling point) ఒక ద్రవ పదార్ధం ఆవిరిగా మారే [[ఉ… |
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పంక్తి 1:
{{మొలక}}
'''బాష్పీభవన స్థానం''' (Boiling point) ఒక ద్రవ పదార్ధం ఆవిరిగా మారే [[ఉష్ణొగ్రత]].
The '''boiling point''' of a liquid is the temperature at which the [[vapor pressure]] of the liquid equals the environmental pressure surrounding the liquid.<ref>{{cite book|author=David.E. Goldberg|title=3,000 Solved Problems in Chemistry|edition=First Edition|publisher=McGraw-Hill|year=1988|id=ISBN 0-07-023684-4}} Section 17.43, page 321</ref><ref>{{cite book|author=Louis Theodore, R. Ryan Dupont and Kumar Ganesan (Editors)|title=Pollution Prevention: The Waste Management Approach to the 21st Century|edition= |publisher=CRC Press|year=1999|id=ISBN 1-56670-495-2}} Section 27, page 15</ref>
A liquid in a vacuum environment has a lower boiling point than when the liquid is at [[atmospheric pressure]]. A liquid in a high pressure environment has a higher boiling point than when the liquid is at atmospheric pressure. In other words, the boiling point of liquids varies with and depends upon the surrounding environmental pressure.
The '''normal boiling point''' (also called the '''atmospheric boiling point''' or the '''atmospheric pressure boiling point''') of a liquid is the special case in which the vapor pressure of the liquid equals the defined atmospheric pressure at sea level, 1 atmosphere.<ref>[http://www.chem.purdue.edu/gchelp/gloss/normalbp.html General Chemistry Glossary] [[Purdue University]] website page</ref><ref>{{cite book|author=Kevin R. Reel, R. M. Fikar, P. E. Dumas, Jay M. Templin, and Patricia Van Arnum|title=AP Chemistry (REA) - The Best Test Prep for the Advanced Placement Exam|edition=9th Edition|publisher=Research & Education Association|year=2006|id=ISBN 0-7386-0221-3}} Section 71, page 224</ref> At that temperature, the vapor pressure of the liquid becomes sufficient to overcome atmospheric pressure and lift the liquid to form bubbles inside the bulk of the liquid. The '''standard boiling point''' is now (as of 1982) defined by [[IUPAC]] as the temperature at which boiling occurs under a pressure of 1 bar.<ref>[http://www.iupac.org/publications/pac/1982/pdf/5406x1239.pdf Notation for States and Processes, Significance of the Word Standard in Chemical Thermodynamics, and Remarks on Commonly Tabulated Forms of Thermodynamic Functions] See page 1274</ref>
The [[heat of vaporization]] is the amount of energy required to convert or vaporize a saturated liquid (i.e., a liquid at its boiling point) into a vapor.
Liquids may change to a vapor at temperatures below their boiling points through the process of [[evaporation]]. Evaporation is a surface phenomenon in which molecules located near the vapor/liquid surface escape into the vapor phase. On the other hand, boiling is a process in which molecules anywhere in the liquid escape, resulting in the formation of vapor bubbles within the liquid.
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