HELP

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ellice
Posts: 193
Joined: 27 Jul 2007, 15:29
Job Title: Lab technician
School: The Illawarra Grammar School
Suburb: Figtree
State/Location: NSW

HELP

Post by ellice »

Hi gang in lab land,
I am trying to make those heat conduction metal rod things with globs of wax on them, and can't get the wax to stay on the rods!!! Is there a trick to this?
Needed by last lesson today!!
Grateful for any help.
Ellice.
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dime
Posts: 703
Joined: 13 Jun 2007, 09:55
State/Location: NSW

Re: HELP

Post by dime »

They use drawing pins stuck on with vaseline here. So when the rod heats up the pin drops off. I keep the same drawing pins from year to year in a specimen container as they have vaseline on them, but of course you could use new ones. But the teacher gets the students to stick 'em on as part of the experiment. :D
ellice
Posts: 193
Joined: 27 Jul 2007, 15:29
Job Title: Lab technician
School: The Illawarra Grammar School
Suburb: Figtree
State/Location: NSW

Re: HELP

Post by ellice »

I love it!! Thanks Dime.
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lurra
Posts: 114
Joined: 23 Mar 2011, 07:54
Job Title: Lab Tech
School: Greystanes High School
Suburb: Greystanes
State/Location: NSW

Re: HELP

Post by lurra »

I have the ready made ones that you put the wax beads on and put over the bursen burner they work great.
Lurra AKA Noona
Rosalie Cassar
Lab Tech
Greystanes H S

ROSALIE.CASSAR@det.nsw.edu.au
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rodannt
Posts: 107
Joined: 27 May 2008, 14:58
State/Location: VIC

Re: HELP

Post by rodannt »

Our classes use small balls of plasticine..no complaints so far
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sunray18
Posts: 1487
Joined: 14 Feb 2008, 12:30
State/Location: NSW

Re: HELP

Post by sunray18 »

try blu-tac
RosalieL
Posts: 86
Joined: 28 Jan 2021, 13:24
Job Title: Lab Assistant
School: MCS
State/Location: NSW

Re: HELP

Post by RosalieL »

Does anyone use the conductivity stars? They have little wells at the end of each metal rod for wax. I’m just wondering what methods you use to get the wax in there? Do you just scrape a bit off the cube of wax that comes with them? They are tiny!
Ines
Posts: 24
Joined: 23 Mar 2012, 13:56
State/Location: NSW

Re: HELP

Post by Ines »

Hi Rosaliel,
We use Paraffin wax pellets (beaded) from Chem-Supply PT200-500G, the pellets fit nicely in the wells of the conductivity stars. I scrape the wax of the wells after they have been used so that they are clean for the next class.
bigmack
Posts: 557
Joined: 15 Dec 2015, 10:49
Job Title: Lab Assistant
State/Location: NSW

Re: HELP

Post by bigmack »

RosalieL wrote: 22 Jul 2021, 16:06 Does anyone use the conductivity stars? They have little wells at the end of each metal rod for wax. I’m just wondering what methods you use to get the wax in there? Do you just scrape a bit off the cube of wax that comes with them? They are tiny!
Just be careful , they weren't all created equally .
we had an old IEC one which we would stick a Bunsen burner under ....it worked fine .

Got some from Serrata and missed the fine print where it said " don't use on a Bunsen , use a spirit lamp " .....they melted :-(

regarding the wax .
When we had one as a teacher demo , we ( I) would stand a match stick in each wax well ( melted in with wax) . The kids could see which order the matches fell . Now we have a class set , the kids just watch and observe the wax as it melts . We have pellets . Some teachers prefer to hand out fresh pellets with each unit , some just say there's enough wax already there for the kids to see melt .
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melsid
Posts: 314
Joined: 07 Apr 2013, 07:11
Job Title: Lab Rat
School: PHS
State/Location: NSW

Re: HELP

Post by melsid »

I light a candle and drip the wax onto the wells, it works every time!
kimmy68
Posts: 3
Joined: 21 Jul 2021, 12:22
Job Title: Lab Assistant
School: Quirindi High School
State/Location: NSW

Re: HELP

Post by kimmy68 »

our teachers have changed from using Vaseline to small balls of plasticine, so much easier.
karend
Posts: 57
Joined: 10 Aug 2012, 14:13
State/Location: NSW

Re: HELP

Post by karend »

Like the sound of that, Kimmy
RosalieL
Posts: 86
Joined: 28 Jan 2021, 13:24
Job Title: Lab Assistant
School: MCS
State/Location: NSW

Re: HELP

Post by RosalieL »

We have one star that one of the arms/prongs/whatever you want to call it has snapped off. I am assuming this is irreparable? Seems such a waste to throw it in the bin though…
mtg
Posts: 394
Joined: 15 Aug 2011, 10:48
Job Title: Lab Tech
School: NDSC
Suburb: west gippsland
State/Location: VIC

Re: HELP

Post by mtg »

melsid wrote: 26 Jul 2021, 12:09 I light a candle and drip the wax onto the wells, it works every time!
Same. I used to put a bit of a toothpick in the wax but so hard, so now just melt a bit of wax too.
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