How would steam pressure move a lid?

Yup, you'd ninja'd me.
IF the "pressure increased" (- increased rate of boiling?) - there could be more lifting of the lid but certainly increased velocity of the escaping steam.
It'd be a bastard of a calculation to do (even IF we had weights and sizes) to find where lift/ velocity "balanced".

 

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Pressure does increase inside a pot boiling. Yes.

Buy a kettle and watch it.

A Billvon,


When pressure is released from an object it only releases enough steam to overcome the gravity force seal of the flat lid. The pot still would contain pressure, just not enough to overcome that seal.
There's no real seal. There's a surface that steam is pressing against. When the steam pressure overcomes the weight of the cover then the cover will lift just enough to exhaust the steam.

If the lid falls back upon the pot due to gravity and the lids are all flat as mentioned in the original post. That is a seal. It is not a seal with a gasket but is a seal nonetheless.

It is a shame you have jumped on this ignorance word play bandwagon.

I gave you a modicum of respect for your comment in the computer thread. Withdrawn.

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Exchemist, Rate of flow confusion? I said increasing pressure from the beginning. (very first post). I used boiling water and a light lid as just an easy example.
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Too many here just wish to misquote, mis-direct, and obfuscate with innuendo.

This is child level physics.

IN the second comment here...

A fellow (rainbow guy) suggested that a 1" overlap on a pot is silly as the pot could be the size of a thimble. OKAY! TRUE!. So I had to revamp my overlap and say 10% for idiots like him.

I assumed most here would know what the average pot (not what you're smoking either) would look like and I bet you all use similar averages in your explanations.

By saying "Pot". I meant AVERAGE sizes.

Now you all seem to be re-routing my words to imply I meant some kind of super heavy lid.

For a steam experiment that involves steam (doesn't get very high in pressure compared to some chemical compositions). I suggested a very light lid.

Perhaps it would help your brains if we made the lid even lighter than a thin sheet of sheet metal as was outlined many times.

Instead; Think of the lid as a thin sheet of vellum (plastic).. just rigid enough to keep flat under some heat.

Every last one of you is on board with that lid REMAINING ON THE BOILING POT. That is why I seriously doubt there is a brain cell between the lot of you.

I miscalculated in thinking sciforums might have people who knew science.

 

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It seems that sooner or later, the lid will begin to move horizontally

a rectangle with sides a,b,c,d(opposite sides axc bxd)
if the steam exits at d then the lid should, most likely, eventually move toward b until it opens a gap, then the steam escapes unfettered by the restraining lid.

 

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Wow.
A real answer.

That is the very first one. That was comment number 43.

Thank you.

 

How does merely watching show that pressure increases (after it's started boiling).
Does just looking at something give accurate read outs?

And then when the pressure reaches a sufficient strength to lift the lid it will do so, breaking that "seal" and releasing the pressure.

Nope.
Seal: a device or substance that is used to join two things together so as to prevent them from coming apart or to prevent anything from passing between them.

You did. But you were wrong.

No, your "miscalculation" was in thinking that we'd blindly accept your unsupported bullshit as being valid.

 

I'm going to check the plans for my house to check if anyone called Bob the builder was involved

Is so I'm moving

Can't be to careful

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Why? This is the physics section and how a boiling pot of water could affect a very light lid is generally child level physics.

It is you that cannot answer the question.

I will check to see if my house was built by a Michael. At least I understand how a light lid would react under growing pressure. You have not suggested you have a clue.

So far the only one of you that proposed an answer was in post # 43. It seems like you lot are too dumb for infant level science.

 

And yet post 43 doesn't say what you claimed, nor does it conflict with anything the rest of us have written.

 

YES! You have told me time and again it would not move at all... 100 times by now. So it DOES conflict with everyone here.

I did not say I agreed with Post # 43. I just got so excited to not get a bullcrap answer I let it be.

It took 4 pages and 43 comment for one of you to actually answer a child level physics problem. Not a bright lot are you?

However; if the lid moved as suggested by answer in 43. What would keep the lid moving linear in a horizontal fashion? Nothing.

It would start to skew and then the escaping pressure would find quicker low pressure routes at the corners. Simple.

Remember this light lid has no tongue in groove. Although you CLAIM to be a design Engineer with 40+ years experience.

You tell US? If you think different. I bet you just copy and past this quote and demonstrate you never finished grade school.

 

And now you've resorted to outright lying.
Please provide a post number where I wrote that. Go on, despite your claim of "100 times" just give ONE post.

That depends on what - exactly - you mean by "moving linear in a horizontal fashion">.

1) If there's ALREADY a venting gap then what makes you think that a corner is "lower pressure route"?

And back to the ad hom again.
Isn't it funny how you provide NOTHING but unsupported claims and persist in assuming you're right while everyone else is wrong?

And the insults again.
By the way you're nearly right.
I didn't complete grade school. But that's because I never started it. In fact I have no idea whatsoever what "grade school" is.
Because they don't exist in the UK.
Although I didn't "copy and past" the quote...

 

ANSWER GIVEN in post # 43 said "horizontal" ask him to clarify. I said it would skew first. That makes the distance between "a" and "b" shorter. If it just skews a tiny bit it would then amplify effect. (too many words for you?)

HUH? Re-read the Opening post. This is asking a question on how steam would affect a lid. If you want peer reviewed science on how lid would act when lifted by presure.. buy a pot and a lid. Don't waste time debating it.

How is asking a question on child physics here an unsupported claim?

AND... Hmmm. I could find ad hominem attacks in almost every single posting from you and others here. Go cry to your mommy if your glass house gets broken

Again.. you blind us with your claims of expertise, but show me one (just ONE) comment from you where you try to answer this child level physics question.

Yes. You make it obvious UK does not have grade school.

This is post 51. Only post 43 gave an attempt at answering this child level physics question.

I would find more science on a Bill Nye channel for kids.

 

What does that have to do with "moving linear in a horizontal fashion"?
It wouldn't skew first.

Not really.

Posts 8, 13, 17, 20... (that's four[1], there are others). The fact that you disagree with them or don't like them them doesn't mean they aren't physics.

Still waiting for you to give a post number where I said it would not move at all.
Or do you think that by ignoring being called out on lying will somehow mean you can pretend that you haven't lied?

1 In fact it's 4 out of my first 5 posts in this thread.

 

Who said anything about it moving in a Horizontal fashion? Strawman much?

That certainly has never been a claim by me. I may have been referring to THE ONLY ACTUAL ANSWER TO THIS CHILD LEVEL PHYSICS QUESTION IN COMMENT # 43.

But.. Its easier to obfuscate because you cannot answer the simple question.

 

also seems likely

 

That would have been you:

Ah, diversion. You're the one that brought up the idea of "horizontal fashion" in the first place.
If you actually read what I wrote it was never stated that you had claimed that. What I asked was "What does that have to do with "moving linear in a horizontal fashion"?"

And you're wrong again.

No, you're mistaking me giving you answer you don't like with not giving an answer at all.
Still can't find a post of mine where I claimed it wouldn't move at all?
Any more lies to tell?

 

A lighter lid would cause less pressure buildup, not more.

As long as the steam is being vented by the burping lid, there's no reason to expect any significant buildup.

Maybe so but it's still as wrong now as it was then.

 

I had said: Who said anything about it moving in a Horizontal fashion? Strawman much?

Then you answer:

NO. NO. NO. NO. NO.

You can lie and strawman all you like, but that is your obsfucation.

RE-READ THE FIRST SENTENCE FROM THE ONLY HONEST ANSWERER IN POST # 43.

It seems that sooner or later, the lid will begin to move horizontally (FROM SOMEONE ELSE - IN POST # 43)

NOTE: That was SOMEONE OTHER THAN ME. (It would always move horizontally and vertically up and down technically).

HOWEVER; I am not the first to use the word "Horizontal" on this entire thread.

Maybe English is your second language or you are just an idiot or a troll.

Liar and strawman.

I was using the language from a previous comment to refute the notion it would move in one direction or another. I suggest it would skew.

If you say "Pixies are real underwater" and I say "How could your pixies breath underwater?" It does not mean I endorse your pixies.


Sorry sculptor for having you mixed up in this idiocy. You are the only person in this entire sciforums place that seems to grasp physics.

 

The word horizontally was used, not the phrase "moving linear in a horizontal fashion?" - which was what I queried.
Oh, FYI I have the poster of that particular post on ignore.

Says the guy who accused me of claiming "time and again it would not move at all" but has yet to provide any support.

Yes, you have suggested this. But you've failed to provide any rationale as to why it would be the case.

If the corners were in fact a "quicker low pressure route" then why doesn't the initial steam escape START there? (Clue: because your claim has no meaning).

 

Wow!
You represent Sciforums well at least. I have not seen much intelligence from this group.

 

Perhaps at this point the wisest thing to do would be to stop digging?