Thermodynamics B/C

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WhatScience?
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Re: Thermodynamics B/C

Post by WhatScience? »

aniSUKSatCHEM wrote:
WhatScience? wrote:Today, I've been responding to everything within two minutes

feeling helpful
Yes, man. I really truly appreciate your help. I think that PUR foam might actually work for me, and you have no idea how much you saved me. I wish I could help you back!

By the way, do you think the following link has asbestos, mineral wool, or fiberglass?

https://www.amazon.com/FoamTouch-Uphols ... ome-garden

Thanks!
it probably doesn't

if you really wanna pay me back I'll take some thermo notes sent to whatsciencescioly@gmail.com...will give you an equal number of pages back :lol: (but srsly hit me up bro)
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Re: Thermodynamics B/C

Post by Alex-RCHS »

I've found other reasons why Polyurethane may not be the best option. Closed-cell foams decrease in R-value per inch over time as some of the gas trapped inside the cells escapes. It probably will not have much of a negative effect, but it's enough to dissuade me from using it.
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Re: Thermodynamics B/C

Post by aniSUKSatCHEM »

WhatScience? wrote:
aniSUKSatCHEM wrote:
WhatScience? wrote:Today, I've been responding to everything within two minutes

feeling helpful
Yes, man. I really truly appreciate your help. I think that PUR foam might actually work for me, and you have no idea how much you saved me. I wish I could help you back!

By the way, do you think the following link has asbestos, mineral wool, or fiberglass?

https://www.amazon.com/FoamTouch-Uphols ... ome-garden

Thanks!
it probably doesn't

if you really wanna pay me back I'll take some thermo notes sent to whatsciencescioly@gmail.com...will give you an equal number of pages back :lol: (but srsly hit me up bro)
Alright, I will let you know if I can make my notes in time. And I certainly want to give you some decent quality notes, of course, not just some misleading stuff. If I end up with something ;) I'll let you know! Thanks for all of your help!
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Re: Thermodynamics B/C

Post by mkroy128 »

Ice Water Bonus (IWB) = (volume of ice water in ml /10) points
Teams may elect to add up to 50 mL of water from an ice bath to their internal beaker immediately after
receiving the hot water for bonus points. Each team may choose their own volume.

Do any of you know how to effectively use ice water in this event to your advantage? Is 5 points extra really worth the ice water, along with more careful predictions of the final insulator beaker? Or is it useless?
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Re: Thermodynamics B/C

Post by aniSUKSatCHEM »

Alex-RCHS wrote:I've found other reasons why Polyurethane may not be the best option. Closed-cell foams decrease in R-value per inch over time as some of the gas trapped inside the cells escapes. It probably will not have much of a negative effect, but it's enough to dissuade me from using it.
What do you mean by "over time"? I think your perspective on this is quite interesting, and something worth considering. Do you think this will be a major problem over the course of two months, for example?
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Re: Thermodynamics B/C

Post by WhatScience? »

aniSUKSatCHEM wrote:
Alex-RCHS wrote:I've found other reasons why Polyurethane may not be the best option. Closed-cell foams decrease in R-value per inch over time as some of the gas trapped inside the cells escapes. It probably will not have much of a negative effect, but it's enough to dissuade me from using it.
What do you mean by "over time"? I think your perspective on this is quite interesting, and something worth considering. Do you think this will be a major problem over the course of two months, for example?
Alex, should still answer this but from personal experience...I still haven't noticed a difference
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Re: Thermodynamics B/C

Post by Alex-RCHS »

WhatScience? wrote:
aniSUKSatCHEM wrote:
Alex-RCHS wrote:I've found other reasons why Polyurethane may not be the best option. Closed-cell foams decrease in R-value per inch over time as some of the gas trapped inside the cells escapes. It probably will not have much of a negative effect, but it's enough to dissuade me from using it.
What do you mean by "over time"? I think your perspective on this is quite interesting, and something worth considering. Do you think this will be a major problem over the course of two months, for example?
Alex, should still answer this but from personal experience...I still haven't noticed a difference
In fairness, I haven’t tested it either, but that’s why I said that I wouldn’t use it, not that it was bad.

The truth is I’m not sure. But if you look up “polyurethane insulation over time” or something like that you’ll find many results. I’ve seen values saying that there’s a significant difference after just 6 months, but I’ve also seen that there’s no significant change after 2 years... I’m not really sure which is right, and it’s probable that the effect is negligible but it’s not a risk I’d like to take, personally.

Edit: here’s a link: https://www.ncptt.nps.gov/blog/new-repo ... -released/

The x axis on that graph is kind of misleading because that is time spent in an aging chamber; it’s unclear how what the real-life time scale is.
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Re: Thermodynamics B/C

Post by arv101 »

mkroy128 wrote:Ice Water Bonus (IWB) = (volume of ice water in ml /10) points
Teams may elect to add up to 50 mL of water from an ice bath to their internal beaker immediately after
receiving the hot water for bonus points. Each team may choose their own volume.

Do any of you know how to effectively use ice water in this event to your advantage? Is 5 points extra really worth the ice water, along with more careful predictions of the final insulator beaker? Or is it useless?
Those 5 points could help if you can predict it right.I don't really know but 10 points made the difference of like 10 rankings at an invitational so the 5 points could give you an upper edge.
What did the thermometer say to the graduated cylinder?
"You may have graduated, but I have many degrees"
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Re: Thermodynamics B/C

Post by arv101 »

WhatScience? wrote:
aniSUKSatCHEM wrote:
WhatScience? wrote:Today, I've been responding to everything within two minutes

feeling helpful
Yes, man. I really truly appreciate your help. I think that PUR foam might actually work for me, and you have no idea how much you saved me. I wish I could help you back!

By the way, do you think the following link has asbestos, mineral wool, or fiberglass?

https://www.amazon.com/FoamTouch-Uphols ... ome-garden

Thanks!
it probably doesn't

if you really wanna pay me back I'll take some thermo notes sent to whatsciencescioly@gmail.com...will give you an equal number of pages back :lol: (but srsly hit me up bro)
Hey do you guys want to do that mock test thing again? Possibly with builld if you are done?
What did the thermometer say to the graduated cylinder?
"You may have graduated, but I have many degrees"
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Re: Thermodynamics B/C

Post by bt03 »

Practice tests are great and all.
That is, when you find one that is out of the world to a normal physics student and then one which is relatively comparable to a physics/chemistry student that knows gas laws and basic thermodynamics.

TL;DR: Who can suggest a practice test that is reasonable for the 2018 B Division?
Random Fact 1: Water isn't wet. You can get wet by water, but water doesn't make water wet.
Random Fact 2: Is fire hot? Fire makes things hot, but can fire make fire hotter?

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