Magnetic Stir
A look at what is currently available on eBay
 1 inch magnetic stirrer bar stir mixer bars PTFE New US $5.75 
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 6pcs PTFE magnetic stirrer mixer stir egg shape US $18.00
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 New Fisherbrand Magnetic Stir bar 1" x 5/16" 25 x 8mm US $6.25
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 New 1 inch egg PTFE magnetic stirrer stir bar 100-250ml US $4.99
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 Fisherbrand Plus Cross Magnetic Stir bar 1-1/2" 38mm US $10.30
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 Fisherbrand Magnetic Stir bar (76 x 13mm) 3 x 1/2" new US $10.50
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Effect of stirring action on heat absobtion into water?
I did an experiment which produced results that suggest that water absorbs heat more quickly if a magnetic stirrer is used in the same container with the same heat source. Is this to do with hot water conducting heat less efficiently than cold water? If not, can someone explain please? Thanks.
If the atoms of the container wall are the same temperature as the water molecules temperature no net heat transfer will occur (energy will be passed back and forth with no net change). The hot vibrating atoms of the container wall can impart more energy to relatively cold water molecules. The magnetic stirrer would help supply 'fresh' cold water molecules in contact with the container wall maximizing heat transfer compared with natural circulation due to density change.
Items recently purchased from this site
BEL-ART PRODUCTS SCIENCEWARE COOL STIR MAGNETIC STIRRER 370280000, BELLCO BELL-ENNIUM 7785-D1036 1 POSITION MAGNETIC STIRRER STIR PLATE STIRPLATE, Bellco Bell Stir Heavy Duty Magnetic Stirrer w/Piggyback Stirrer, Cat# 7760/7762, Bellco Bell Stir 4 position magnetic Stirrer 7760-06005 10" x10" top, Eight Magnetic Hanna Stirrers Stirrer Stir Plate HI180F/U HI 180 HI180, Fisher Plus Cross Magnetic Stir bar 1-1/2" 38mm 50/cs, Fisher Plus Cross Magnetic Stir bar 1-1/4" 32mm 50/cs, Fisherbrand Plus Cross Magnetic Stir bar 1" 25mm 50/cs, Bellco Bell Stir 1 position magnetic Stirrer 7760-06003, Fisher Plus Cross Magnetic Stir bar 3/4" 19mm 50/cs NEW, Fisher Plus Cross Magnetic Stir bar 3/8" 10mm 50/cs, TESTED six-position magnetic stirrer/stir plate, Fisher 18" Magnetic Stir Bar Retriever Stirring 36/cs, Fisherbrand Magnetic Stir bar (76 x 13mm) 3"x1/2" 50/cs, Digital hotplate hot plate magnetic stirrer stir barII, Bell Stir 4 position magnetic Stirrer 7760-06005, Fisher 12" Magnetic Stir Bar Retriever Stirring 36/cs, Stir-Kool SK 14 Thermoelectrics Magnetic Stirrer, Set 50 Fisherbrand Magnetic Stir bar 64 x 10mm 2-1/2" L, Bellco, Bell Stir Magnetic Stirrer, Cat# 7760-06000 , NEW UK STOCK MS400 HOT PLATE MAGNETIC STIRRER WITH Stirring Stir Bar and Probe, Bellco, Bell Stir Magnetic Stirrer Bell-Stir 6x6 Top, Electric hotplate hot plate magnetic stirrer stir barII, WORKING BELLCO BELL STIR MULTI STIR 4 PLACE MAGNETIC, Wheaton Micro Stir Model II Magnetic Stirrer!, BELL-STIR MAGNETIC STIRRER 6000, Bell Stir Multy Stir 4 Magnetic Stirrer 776006005 Works, Lab-line multi-magnestir stir stirrer point 6 magnetic, Lab-line multi-magnestir stir stirrer point 6 magnet, Bellco 7760-06003 BELL STIR 1 10" x 10" Heavy-Duty Magnetic Stirrer/Mixer, Bellco, Bell Stir Magnetic Stirrer Bell-Stir 6x6 Top, Bellco Bell Stir Magnetic Stirrer 6x6 top , BELL STIR MULTI STIR 4 MAGNETIC STIRRER 7760-06005, Electric Hot Plate w Magnetic Stirrer Hotplate Stir Bar, THERMOLYNE SYBRON S17415 STUDENT MAGNETIC STIRRER PLATE MAGNETIC STIR VARIABLE S, Bellco Bell Stir Multi Stir 4 Magnetic Stirrer/Mixer, BELLCO BELL STIR MULTI STIR 4 PLACE MAGNETIC STIRRER WORKING , Fisher Magnetic Stir bar 51 x 8mm (2" x 5/16") 50/cs, 50/cs Fisher Magnetic Stir bar 2" x 5/16" 51 x 8mm, Fisher Magnetic Stir bar 38 x 8mm 1-1/2" x 5/16 50/cs, Fisher Magnetic Stir bar 25 x 8mm (1" x 5/16") 50/cs, Electric hotplate hot plate magnetic stirrer w stir bar, Fisher Magnetic Stir bar 13mm x 8mm 1/2 x 5/16" 50/cs, Fisher Magnetic Stir bar 13 x 3.2mm (1/2x1/8") 50/cs, Electric hotplate hot plate magnetic stirrer w stir bar, BELL STIR MULTI STIR 4 MAGNETIC STIRRER , Brand NEW lab hotplate hot plate magnetic stirrer w stir bars spin mixer heater, CORNING MAGNETIC STIR STIRRER LAB EQUI, FISHER SCIENTIFIC / ALLIED THERMIX 120M, MAGNETIC STIR STIRRER PLATE - USED w/WA, Electric hotplate magnetic stirrer w/stir bar hot plate, Fisher Magnetic Stir bar 51 x 8mm (2" x 5/16") 25/cs, Lab-line magnestir stirrer mixer magnetic stir used, Lab-line magnestir stirrer mixer magnetic stir magnet, Troemner model 500 magnetic stir lab bench table top stirrer GREAT SHAPE!, Set 30 Fisherbrand Magnetic Octagonal PTFE Stir Bars , Fisher Magnetic Stir bar 38 x 8mm 1-1/2" x 5/16 25/cs, Fisher Magnetic Stir bar 25 x 8mm (1" x 5/16") 25/cs, Fisher Magnetic Stir bar 13mm x 8mm 1/2 x 5/16" 25/cs, Fisher Magnetic Stir bar 13 x 3.2mm (1/2x1/8") 25/cs, THERMOLYNE Stir-Light Illuminated Magnetic Stirrer SL7225 7"x7" 100-1000rpm 120V, Fisherbrand Assorted Octagonal Magnetic Stir Bar Kit 16 / set, 16 Assorted Fisherbrand Octagonal Magnetic Stir Bar Kit, Assorted Fisherbrand Octagonal Magnetic Stir Bar Kit Set of 16, Lot 16 Assorted Fisher Octagonal Magnetic Stir Bar Kit, 20 magnetic stirrer bar stir mixer bars PTFE New, BEL-ART SCIENCEWARE COOL STIR MAGNETIC STIRRER 370280000, 16 Assorted Fisherbrand Octagonal Magnetic Stir Bar Kit, Lot 16 Assorted Fisher Octagonal Magnetic Stir Bar Kit, Magnetic Yeast Stir Plate For Homebrewing--Brew Smarter with a StirStarter!, Brew Smarter with a StirStarter! Magnetic Stir Plate For Home Brewers, Ten Stirbars Magnetic Stir Bars Teflon Mixing 3" x 1/2", Lot 10 Fisherbrand Magnetic Stir bar 2" (51 x 8mm), 20 magnetic stirrer bar stir mixer bars PTFE New, Lot 10 Fisherbrand Magnetic Stir bar 1-1/2" (38 x 8mm), 8 Lot MAGNETIC STIR BARS Lab Laboratory 16mm Egg Shape Stirrers Mixing magnets !, 5 Lot MAGNETIC STIR BARS Lab Laboratory 60mm Stirrers , VWR Scientific Vanlab DYLA-STIR 58935-250 Magnetic Stirrer 120VAC 5W FOR PARTS, Lot 10 Fisherbrand Magnetic Stir bar 1" (25 x 8mm), New MAGNETIC STIR BAR Lab Laboratory 30mm Egg Shape Mix, Bellco Glass Model 1 Bell-Stir Multi-Stir 4-Position Magnetic Stirrer, Lot 10 Fisherbrand Magnetic Stir bar 1/2" (13 x 8mm), Lot 7 Fisher Scientific Magnetic Octagonal Stir Bars, Set of 7 Fisher Various Magnetic Octagonal Stir Bar, Set 6 Fisher Magnetic Stir bar 64 x 10mm (2-1/2 x 3/8"), Lot 10 Fisherbrand Magnetic Stir bar 1/2" (13 x 3.2mm), Set of 20 magnetic stirrer bar stir mixer spin bars (1/4" to 2.5") PTFE New, Lot of 6 various 60mm Magnetic Stir Bars., Lot 6 Fisher Magnetic Stir bar 51mm x 8mm 2 x 5/16", New 10 Lot MAGNETIC STIR BARS Lab Laboratory 20mm Stirrers Mixing Magnets, Set 6 Fisherbrand Magnetic Stir bar 51 x 8mm 2 x 5/16", 6 Fisherbrand Magnetic Stir bar 2" x 5/16" 51 x 8mm, Lots of 5 50mm Magnetic Stir Bars., Lots of 5 60mm Magnetic Stir Bars., Lot of 5 various 50mm Magnetic Stir Bars., NEW! 3.5 inch magnetic stirrer bar stir mixer bars PTFE, Set of 6 Fisher Magnetic Stir bar 38 x 8mm 11/2 x 5/16", Lot 6 Fisher Magnetic Stir bar 38 x 8mm 1-1/2 x 5/16", 6 Fisherbrand Magnetic Stir bar 1-1/2" x 5/16" 38 x 8mm, Magnetic Stir Bar Retriever/Remover 5/pack,
January 29th, 2006 in
Uncategorized | tags: brewing, diy, homebrew, lab, magnetic, magnetic stir bars, magnetic stir plate, magnetic stirrer, magnetic stirrer diy, magnetic stirrer hot plate, magnetic stirring rod, magnetic stirrups, stir, stirrer