submit urlsubmit rss feedadd directory

article

Evaporation is one of the two forms of vaporization. It is the process whereby atoms or molecules in a liquid state (or solid state if the substance sublimes) gain sufficient energy to enter the gaseous state. It's the opposite process of condensation.

The thermal motion of a molecule of liquid must be sufficient to overcome the surface tension and evaporate, that is, its kinetic energy must exceed the work function of cohesion at the surface. Evaporation therefore, proceeds more quickly at higher temperature, at higher flow rates between the gaseous and liquid phase and in liquids with lower surface tension (i.e. higher vapor pressure). Since only a small proportion of the molecules are located near the surface and are moving in the proper direction to escape at any given instant, the rate of evaporation is limited. Also, as the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid thus decreases. This phenomenon is also called evaporative cooling. This is the reason that evaporating sweat cools the human body.

Gas has less order than liquid or solid matter, and thus the entropy of the system is increased, which always requires energy input. This means that the enthalpy change for evaporation (ΔHevaporation) is always positive. Evaporation is a cooling process.

More on [ Evaporation ]


directory of related categories

 
Distillation_and_Evaporation RSS feed
Yahoo! News Search Results for Industrial Goods and_Services

Avoiding Brand Oblivion (E-Commerce Times)
Wed, 06 Feb 2008 13:02:01 -0000
Who are the new champion nations on the global stage delivering the finest performances and altering the course of branded imagery of goods and services? Where are the old traditional nations and what's happening to them today? The global shifts on image repositioning are causing minor quakes throughout various continents as brand new landscapes are erupting.
Chamber to sponsor Consumer Business Expo at Ocean County Mall (Asbury Park Press)
Fri, 08 Feb 2008 09:46:51 -0000
About 40 area businesses are expected to participate in the Toms River-Ocean County Chamber of Commerce's annual Consumer Business Expo at Ocean County Mall this weekend.
How the Big Squeeze is going to affect you (The Australian)
Fri, 08 Feb 2008 13:00:00 -0000
The Reserve bank is using interest rates to slow our overheated economy - and it will have far-reaching effects for all of us
Siemens Industry Sector Reports 'Strong Positive Reaction' to Siemens PLM Software NX 5; Announces Major NX Customer ... (The San Francisco Examiner)
Tue, 05 Feb 2008 17:00:13 -0000
PLANO, Texas, Feb. 5 /PRNewswire/ -- Siemens PLM Software, a business unit of Siemens Industry Sector and a leading global provider of product lifecycle management (PLM) products and services, today announced that Siemens Industry Sector reported "strong positive reaction" to Siemens PLM Software's new NX(R) software as well as a series of major NX customer implementations across key industries.
Dr Cullen is right; tax cuts alone not enough (Scoop.co.nz)
Fri, 08 Feb 2008 03:20:44 -0000
Dr Cullen is right to point out that for our incomes to rise we need to increase our productivity and only business can do that, the Employers & Manufacturers Association (Northern) says.
Letters to the Editor (The Rockingham News)
Fri, 08 Feb 2008 11:01:27 -0000
bid to buy YWCA

 
Subscribe to Industrial_Goods_and_Services RSS feed

directory of related sites

AMT International Inc. - Specializes in supply of products for mass transfer installations for refining, chemical, and petrochemical industries. Includes fractional trays; structured, random, and grid packing; and packed tower and reactor internals.

Artisan Industries Inc. - Provides engineering and manufacturing services for the process industries. Includes supply of evaporation, stripping, distillation, extraction, and vacuum rejection units. Site provides detailed product information.
Meta Description: [ Artisan Industries specializing in separation technology ]

Buss-SMS GmbH Verfahrenstechnik - Germany. Manufactures thermal separation equipment for chemical, pharmaceutical, and polymer processing. Includes units for drying, distillation, and evaporation. Site incorporates detailed technical background information.
Meta Description: [ Spezialist für Thermische Trenntechnik und Membranfiltration ]

Finepac Structures Pvt. Ltd. - India. Specializes in installation of new and revamping of existing distillation and absorption columns with use of structured packing. Site provides detailed account of products and procedures.

Graham Hart (Process Technology) Ltd - UK. Specializes in thermal processing and mass transfer equipment for process industries. Products include heat exchangers, pressure vessels, pilot plants, and distillation, adsorbtion, separation, and scrubbing columns.
Meta Description: [ Specialists in the design and manufacture of process plant and equipment for the Chemical, Petrochemical, Food, Process and Energy Industries. ]

InCon Processing LLC - Specializes in provision of high vacuum molecular distillation and micronutrient recovery equipment and services. Includes equipment design and supply, inhouse processing, and lab support.
Meta Description: [ InCon develops valuable chemical processes that clients cannot develop themselves. InCon builds customer plants using thin film evaporators, wiped film evaporators, short path evaporators or falling film evaporators, or Molecular distillation. ]

Jaeger Products Inc. - Manufactures tower packings, trays, and column internals for gas/liquid mass transfer processes. Site provides detailed product and application information.
Meta Description: [ Manufacturer of tower packing, trays and column internals used in chemical processes and environmental applications. ]

Koch-Glitsch Inc. - Specializes in design and supply of mass transfer equipment. Includes packed tower internals, structured and random packing, trays, demisters, and static mixers. Site incorporates detailed product information and data sheets. suppliers.

LIST Group - Manufactures processing equipment for chemical, food, pharmaceutical, polymer, and environmental industries. Applications include crystallization, compounding, drying, evaporation, mixing, polymerization, and sublimation.

Mabo srl. - Italy. Manufactures process equipment with focus on thin film and other forms of evaporators. Additional lines include colloid mills, indirect and filter dryers, and in-line dispersers.
Meta Description: [ 3V MABO is a Company producing machines for the Chemical, Pharmaceutical and Food Processing Industries and is also qualified to produce Thin Film Evaporators and Wiped Film Evaporators for the Chemical Processing Industry. ]

Newhouse Manufacturing Inc. - Agricultural machinery manufacturer with a line of oil distillation equipment. Site provides details of available units and applications, especially in farming operations.
Meta Description: [ Essential Oil distillation stills, hay choppers for cattle feeding and industrial uses and Mint and Garlic farm equipment are a few of the durable, quality products offered by Newhouse Mfg. ]

500 Ningbo Minquan Chemical Co., Ltd. - Manufacturer of structured and random packings for separation columns, as well as other column internals. Located in China.
Meta Description: [ 公司旨在为化工企业增产,即能与提高产品质量的技术改造服务。 ]

Onpro AG - Switzerland. Supplies thermal processing equipment for chemical, food, pharmaceutical, and petrochemical industries. Main product line is thin film evaporators for heat sensitive, foaming, viscous, and scaling products.

500 Pingxiang Xin'an Industrial Co., Ltd. - Manufacturer of random packing materials for distillation, absorption, and filtration applications. Specializes in ceramic packings, also offers metal and plastic forms.
Meta Description: [ Pingxiang Xin'an Industrial Co., Ltd., is a special manufacurer of the industral Ceramecs.Our main products are as follows:'Huling Brand' Light-Ceramics Packing, 'Huling Brand' Ceramsite Packing, 'Huling Brand' Foam Ceramics, and 'Huling Brand'Cellular Ceramics. ]

Distillation_and_Evaporation related videos
distillation. It is ideal for the distillation of hydrosols and essential oils as it employs both steam and ...
Next Video

 

HOMEADVERTISINGABOUT US

articlesartsbusinesscomputersgameshealthhospitalshomekids & teensnewsmobilephysiciansrecreationreferenceregionalscienceshoppingsocietysportsworld


Submit a Site About Become an Editor