[ARCHIVED THREAD] - Smart Person Needed (Page 1 of 2)
Posted: 4/4/2012 9:27:45 AM EDT
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I think I'm fairly smart, but this has eluded me. So, I thought I'd come to the primary store of knoweldge this side of the universe, GD. I was heating up my lunch today in a Rubbermaid container, with a lid. I forgot to lift the corner, so in the middle of heating in the microwave, the container was expanding and the lid popped open.. Once heated, I removed it from the microwave and closed the lid. While walking back to my desk, the lid and bottom of the container started getting sucked in, until I opened it again and it released. Why would the lid be pushed out while heating and then sucked in once finished heating?
The food in the container was shrimp, asparagus risotto. |
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Heat it up the air expands. Let it cool the air contracts. Close it between those and you get suckage. Now answer me this. Put hot liquid in a thermos it keeps it hot, put cold liquid in there it keeps it cold. How does it know which one? The small micro controller inside. Duh. |
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Heat it up the air expands. Let it cool the air contracts. Close it between those and you get suckage. Now answer me this. Put hot liquid in a thermos it keeps it hot, put cold liquid in there it keeps it cold. How does it know which one? It didn't get sucked in. It got pushed in with barometric pressure @14.7 psi @ sea level. 
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Quoted: Heat it up the air expands. Let it cool the air contracts. Close it between those and you get suckage. Now answer me this. Put hot liquid in a thermos it keeps it hot, put cold liquid in there it keeps it cold. How does it know which one?  Not sure if serious?Both scenarios are heat transfer, it's just a matter of direction. The vacuum between the inner and outer walls minimizes air molecules which could conduct heat energy into OR out of the inner chamber. |
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Changes in brownian motion and the number of impacts of gas molecules against the sides of the container explain everything.
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I think I'm fairly smart, but this has eluded me. So, I thought I'd come to the primary store of knoweldge this side of the universe, GD. I was heating up my lunch today in a Rubbermaid container, with a lid. I forgot to lift the corner, so in the middle of heating in the microwave, the container was expanding and the lid popped open.. Once heated, I removed it from the microwave and closed the lid. While walking back to my desk, the lid and bottom of the container started getting sucked in, until I opened it again and it released. Why would the lid be pushed out while heating and then sucked in once finished heating? The food in the container was shrimp, asparagus risotto. |
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Did you go to the public schools? I did. I knew it had something to do with heating and cooling, I just didn't know it would be that dramatic. Yes, I am a tard sometimes. PM me for a neat trick with a milk bottle, a match, and your dick! I rost! Posted Via AR15.Com Mobile |
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Did you go to the public schools? I did. I knew it had something to do with heating and cooling, I just didn't know it would be that dramatic. Yes, I am a tard sometimes. PM me for a neat trick with a milk bottle, a match, and your dick! IM with pics inbound. |
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Aight serious answer, FWIW.
When it heated, the air expanded, causing an increase in pressure which resulted in the lid popping off as you observed. When you put the lid on, there was the same volume as before, but less mass because it was at a higher temperature. when it cooled, air contracted, resulting in decreased pressure. This created a pressure differential between the inside and outside of the container, so the outside atmosphere pushed in on the container, decreasing it's volume until the pressure inside the container was roughly equal to the pressure outside of the container, along with any resistance offered by the plastic container. |
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Quoted: Quoted: Quoted: Quoted: Did you go to the public schools? I did. I knew it had something to do with heating and cooling, I just didn't know it would be that dramatic. Yes, I am a tard sometimes. PM me for a neat trick with a milk bottle, a match, and your dick! IM with pics inbound. Alright, change of plans. Got an old glass coke bottle? |
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Did you go to the public schools? I did. I knew it had something to do with heating and cooling, I just didn't know it would be that dramatic. Yes, I am a tard sometimes. PM me for a neat trick with a milk bottle, a match, and your dick! IM with pics inbound. Alright, change of plans. Got an old glass coke bottle?  . That was good.
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Aight serious answer, FWIW. When it heated, the air expanded, causing an increase in pressure which resulted in the lid popping off as you observed. When you put the lid on, there was the same volume as before, but less mass because it was at a higher temperature. when it cooled, air contracted, resulting in decreased pressure. This created a pressure differential between the inside and outside of the container, so the outside atmosphere pushed in on the container, decreasing it's volume until the pressure inside the container was roughly equal to the pressure outside of the container, along with any resistance offered by the plastic container. So I think you're saying its kind of like my sack. When its warm outside it expands, but contracts when I get I cold water. It all makes sense now. |
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PV=nRT
...or one of its derivatives or related equations. __________________________________________________________________ Cross-platform gun database/electronic bound book (v1.3.2) (and the original thread). «nolite confidere in principibus, in filiis hominum quibus non est salus» |
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Did you go to the public schools? I did. I knew it had something to do with heating and cooling, I just didn't know it would be that dramatic. Yes, I am a tard sometimes. PM me for a neat trick with a milk bottle, a match, and your dick! IM with pics inbound. Alright, change of plans. Got an old glass coke bottle? I saw a guy extract all the crap from a HUGE ingrown hair on his chest caused by shoulder pads rubbing it. Stuck the bottle in boiling water until it was hot, Then stuck the mouth of the bottle on the hair and poured cold water over the towel around the bottle. That shit exploded into the bottle. NASTY! 
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Did you go to the public schools? I did. I knew it had something to do with heating and cooling, I just didn't know it would be that dramatic. Yes, I am a tard sometimes. PM me for a neat trick with a milk bottle, a match, and your dick! Awesome  
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Did you go to the public schools? I did. I knew it had something to do with heating and cooling, I just didn't know it would be that dramatic. Yes, I am a tard sometimes. PM me for a neat trick with a milk bottle, a match, and your dick! IM with pics inbound. Alright, change of plans. Got an old glass coke bottle? I saw a guy extract all the crap from a HUGE ingrown hair on his chest caused by shoulder pads rubbing it. Stuck the bottle in boiling water until it was hot, Then stuck the mouth of the bottle on the hair and poured cold water over the towel around the bottle. That shit exploded into the bottle. NASTY! Kinda cool. Should have videoed it and put it on youtube. |