Thermodynamics B/C

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pikachu4919
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Re: Thermodynamics B/C

Postby pikachu4919 » Tue Dec 05, 2017 4:00 pm

Alex-RCHS wrote:
Tesel wrote:
Alex-RCHS wrote:Sounds like a good plan to me. Good luck!

What type of plastic are your beakers made of?


I believe they're polystyrene, but I'm having trouble finding the link to confirm.

Interesting. I wasn’t able to find any polystyrene beakers.


I don’t think plastic beakers can be made out of PS, honestly. If I had to make a guess, the most likely case is that they’re made of HDPE or PETE, maybe a chance it could be made of PC but more likely one of the other two
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Re: Thermodynamics B/C

Postby SPP SciO » Tue Dec 05, 2017 4:04 pm

Can anyone clarify rule 3e - specifically, "The top surface of the hole must be less than 12 cm above the inside bottom surface of the beaker" ?

A 250mL beaker is almost 10cm tall, so to be within 12cm of the bottom means the "lid" of the device is necessarily very thin, yes? Or am I misreading this? Was looking at a prototype which had the beaker situated in the middle of a 20cm cube, but after re-reading this rule I don't think it would be allowed... Are there any diagrams posted somewhere?
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Re: Thermodynamics B/C

Postby pikachu4919 » Tue Dec 05, 2017 4:05 pm

Alex-RCHS wrote:
Tesel wrote:
Alex-RCHS wrote:Sounds like a good plan to me. Good luck!

What type of plastic are your beakers made of?


I believe they're polystyrene, but I'm having trouble finding the link to confirm.

Interesting. I wasn’t able to find any polystyrene beakers.


I don’t think plastic beakers can be made of polystyrene (for one, they’d be done if you tried to put acetone in them). If I had to make a guess based on what I know about polymers from Forensics, the most likely case is that they’re made from high density polyethylene or polyethylene terephthalate. Polycarbonate is also possible, but less so than one of the other two.
"I know that greatness lies in you."
"You want a revolution? I want a revelation!"
"I AM NOT THROWING AWAY MY SHOT!"
- Hamilton: An American Musical

Assassinator of 113: Friday the 13th

CARMEL HIGH SCHOOL (IN) '16
PURDUE BIOLOGICAL ENGINEERING '20

Nationals 2016 ~ 4th place Forensics :D

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Re: Thermodynamics B/C

Postby Tesel » Tue Dec 05, 2017 10:56 pm

pikachu4919 wrote:
Alex-RCHS wrote:
Tesel wrote:
I believe they're polystyrene, but I'm having trouble finding the link to confirm.

Interesting. I wasn’t able to find any polystyrene beakers.


I don’t think plastic beakers can be made of polystyrene (for one, they’d be done if you tried to put acetone in them). If I had to make a guess based on what I know about polymers from Forensics, the most likely case is that they’re made from high density polyethylene or polyethylene terephthalate. Polycarbonate is also possible, but less so than one of the other two.


Yeah, I was wrong. The beakers I got had no official specs with regards to material, so your guess is as good as mine. I saw polystyrene when I was looking at something else, and I'm struggling to remember what.
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Re: Thermodynamics B/C

Postby pikachu4919 » Wed Dec 06, 2017 6:45 am

Tesel wrote:
pikachu4919 wrote:
Alex-RCHS wrote:Interesting. I wasn’t able to find any polystyrene beakers.


I don’t think plastic beakers can be made of polystyrene (for one, they’d be done if you tried to put acetone in them). If I had to make a guess based on what I know about polymers from Forensics, the most likely case is that they’re made from high density polyethylene or polyethylene terephthalate. Polycarbonate is also possible, but less so than one of the other two.


Yeah, I was wrong. The beakers I got had no official specs with regards to material, so your guess is as good as mine. I saw polystyrene when I was looking at something else, and I'm struggling to remember what.


Did it have a recycling number on it?
"I know that greatness lies in you."
"You want a revolution? I want a revelation!"
"I AM NOT THROWING AWAY MY SHOT!"
- Hamilton: An American Musical

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PURDUE BIOLOGICAL ENGINEERING '20

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Re: Thermodynamics B/C

Postby Tesel » Wed Dec 06, 2017 5:59 pm

pikachu4919 wrote:
Tesel wrote:
pikachu4919 wrote:
I don’t think plastic beakers can be made of polystyrene (for one, they’d be done if you tried to put acetone in them). If I had to make a guess based on what I know about polymers from Forensics, the most likely case is that they’re made from high density polyethylene or polyethylene terephthalate. Polycarbonate is also possible, but less so than one of the other two.


Yeah, I was wrong. The beakers I got had no official specs with regards to material, so your guess is as good as mine. I saw polystyrene when I was looking at something else, and I'm struggling to remember what.


Did it have a recycling number on it?


I believe they're supposed to ship this afternoon, so I'll check then. Good call!
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Re: Thermodynamics B/C

Postby arv101 » Wed Dec 06, 2017 11:42 pm

Anyone in the east coast (upper) going to Rustin invitational?
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Re: Thermodynamics B/C

Postby shrewdPanther46 » Thu Dec 07, 2017 12:49 am

arv101 wrote:Anyone in the east coast (upper) going to Rustin invitational?

I believe I am. Not sure exactly though...

Anyways, I'm not doing thermodynamics. Good luck (don't screw up) :D
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Re: Thermodynamics B/C

Postby Crtomir » Thu Dec 07, 2017 2:04 pm

Crtomir wrote:With all this talk about aero-gels, most of the ones that are cheap enough are aero-gel beads, not monolithic blocks of aero-gel. A 20x20 cm monolithic block of aero-gel is prohibitively expensive. Filling up a box with aero-gel beads leaves a lot of interstitial space between the beads that is filled with just air. I am wondering if, in the end, aero-gel beads actually work better than just a solid styrofoam block or if, because of the air gaps, the composite system becomes less insulative than just a simple solid styrofoam block? Has anyone taken any real data on this to PROVE that aero-gel beads packed in a box perform better than a solid block of styrofoam?


Anyone have thoughts on this?

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Re: Thermodynamics B/C

Postby Crtomir » Thu Dec 07, 2017 2:05 pm

Another question: ICE WATER BONUS

Is it worth it?

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Re: Thermodynamics B/C

Postby kendreaditya » Thu Dec 07, 2017 8:47 pm

in 3e. the rules states that the hole has to be directly above the device. My hole comes in at a angle, is this ok?

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Re: Thermodynamics B/C

Postby WhatScience? » Fri Dec 08, 2017 1:59 am

Crtomir wrote:Another question: ICE WATER BONUS

Is it worth it?


I don't really think it is...I am pretty sure that the points you get are minimal and due the possibility of varying temperature in ice water, would become harder to accurately predict..
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Re: Thermodynamics B/C

Postby WhatScience? » Fri Dec 08, 2017 2:00 am

Crtomir wrote:
Crtomir wrote:With all this talk about aero-gels, most of the ones that are cheap enough are aero-gel beads, not monolithic blocks of aero-gel. A 20x20 cm monolithic block of aero-gel is prohibitively expensive. Filling up a box with aero-gel beads leaves a lot of interstitial space between the beads that is filled with just air. I am wondering if, in the end, aero-gel beads actually work better than just a solid styrofoam block or if, because of the air gaps, the composite system becomes less insulative than just a simple solid styrofoam block? Has anyone taken any real data on this to PROVE that aero-gel beads packed in a box perform better than a solid block of styrofoam?


Anyone have thoughts on this?


Honestly, my thoughts are don't waste your money on aerogel...with the way the competition is structured, it's not worth it...plenty of other decent insulators out there
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Re: Thermodynamics B/C

Postby arv101 » Fri Dec 08, 2017 3:07 am

shrewdPanther46 wrote:
arv101 wrote:Anyone in the east coast (upper) going to Rustin invitational?

I believe I am. Not sure exactly though...

Anyways, I'm not doing thermodynamics. Good luck (don't screw up) :D

Um okay thanks?
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Re: Thermodynamics B/C

Postby arv101 » Fri Dec 08, 2017 3:08 am

10. Which of the following is not a type of thermodynamic system?
a. Open
b. Insulated
c. Closed
d. isolated

Why is it C and not B ?( This was from a test I found online, did they screw up or am I missing something big)?
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