Which is Greater Pressure?

oh, i could make a good use of the butter lyn, how are you doing?

I think Lyn in this case it is better for the lad to have a hole full of soap , than a soul full of hope.The future is now and it is here.

How many times have we seen this lately? Does no-one understand anymore how to work with units? Calculators have the conversions. I have 2 on my desk right now. The internet is filled with free conversion sites, and yet they still come to us. (????)

You're right - weep for the future.

The really perverse part of this is harshitpatel is a person who claims to be a professional.

I quote, "I have commisioned a 11 KV, 630 A VCB for supplying a 315 KVA 11/.440 KV Transformer."

This quote from:

VCB Tripping.

Here is a person who claims to be a professional, something, who has no clue about anything. NOTHING!
Put aside the demonstrated laziness and ineptitude and get to the ethics of this person and we have a fraud. Not to mention the potential deaths that harshit could cause by his lack of common sense.
If this sounds harsh, that is my intention.

Another hint:

One pound per square inch is a little over 700 kilograms per square meter. One pound is a little under half a kilogram.

Please check out units like bar, tor, atmosphere, Megapascals, etc. If you have to ask this kind of a question, please do not use inane units like furlongs per fortnight. Perhaps butter/slice is a better unit than KG/in^2......i too weep, Lyn.

Pressure is force per lateral area. P=F/A, you try to imagine if area get's bigger, then P pressure would be less. as for such 1 kg/in2 is greater obviously than in kg/m2

You really need to get hold of a unit change calculator, Murphy. I'm with Lyn on this. It's so sad.

I suggest an experiment!

get something big and heavy and rest it on your hand. The weight is spread over a large area. now repeat the test with the weight resting on the head of a big nail and the point of the nail resting on your hand.
The weight is now spread over a very small area.
Which feels like it is exerting more pressure on your hand.
If you cannot discern the difference become an accountant

Del

Hi Del If i was the man, I would not dare trying the nail on my hands.

"If you cannot discern the difference become an accountant"

Like we need more people like THAT as accountants.

Then again, if he does the test and can tell us afterwards that he couldn't tell the difference, he might be overqualified to be an accountant, too hard-headed.

Dear Mr.harshitpatel,

One Metre = 3.28 Feet = 39.36 inches. Hence 1 Sq.M = (39.36)^2 = 1559.20

Load is 1 Kg. as stated by you. Hence, PRESSURE is 1 Kg/Sq.Inch, in first case, and 1 Kg./1559.20 Sq.In = 0.0006413 Kg./Sq.M.

Hence 1 Kg/Sq.In is higher pressure than the 1 Kg./Sq.Metre

Now, I hope you have understood the subject.

DHAYANANDHAN.S

Kilogram is a unit of mass, not force, so KG/in2 and KG/m2 are not units of pressure.

Picky picky pedantic piffle which will do nothing to enlighten the original poster.

I think we can infer "killogram weight" from the question and I feel safe it is to assume he is on planet Earth.

A pox on units like the Pascal which the man in the street can't relate to. At least pounds per squer inch etc have some chance of being visualised (even tho' the OP seems unable to visualise his backside without a mirror!)

Del (from the planet Tharg)

Picky picky pedantic piffle which will do nothing to enlighten the original poster.

Not until he tries to work a problem and the units don't come out right.

He's not working the problem, we are. He's going to be a manager.

Aw, come on, he shows the talents to become the infrastructure projects manager at a federal agency, probably the department of energy.

Seriously, haven't you noticed the level of knowledge exhibited by some posters who are already in charge of big deal enterprises ?.

Ok maybe Mr. Patel is just a kid, a student, nothing's wrong with that, just needs to focus on the subject; it is so simple that the only way of not understanding it, is if you are not interested, and even then you might grab it.

If only he were in the minority.

After further consideration of the relevance of all the posts proffered so far, the prophet from Tharg gets a GA.

OP doesn't know the difference between mass and force, so I suggest he coat his backside with 1KG of butter and sit on a one square meter surface, while using the afore mentioned mirror for alignment.

He should then reapply the 1KG of butter and sit on a one square inch surface.

That will do far more damage to his brains, since we know where his head is.

That's too easy! Should have said apply a slug of butter to his backside for the square inch. Then the equivalent amount of butter in kg for the square meter.

Let's keep imperial and metric on their respective sides of the isle here. :D

hey Rixter, I suppose, what should you call a 1 kg butter you buy from the market? Would it be the same 1 kg of butter on the moon(using the same scale)?

1 kgF = 9.8N, more to it comparing the two Kg/in2 and kg/m2, kg cancel out, why do we even bother about it. The main thing is the area, sq.m is more than sq. inch, obviously you know what we're talking about. Isn't it? Cheers, mate.

If it's a spring scale, you get more for your money on the moon, assuming the prices are the same (unlikely due to transportation costs). However, if it's a balance with counterweights, it works out the same.

Call it area density instead of pressure and I'm happy.

Aha, smart ass Rixter, "area density" sounds confusing though.

There's only one dense area, and it's not his backside in this case!

1 in² = 0.0064516m²

1 kg/in² = 1kg/0.0006451m² = 1,550 kg/m²

Homework question? If so, did you not listen to your teacher?

The question is SO simple as to be probably an embarrassment for you in even asking it, basically very simple math......It appears to me that the "units" have beaten you!! Am I right?

Please let us know the real reason why you are asking this question, maybe that will change my mind!!

Have a good day anyway...

Imagine a board 1 inch square with a 1kg weight on it.

Imagine another board 1 metre square with gridlines drawn at every inch.

Then imagine a 1kg weight in every inch square.

Compare the total weight of each loaded board.

Which board will be heavier? - note that the heavier board will have the higher pressure.

If you cant imagine this, then make two boards for real and place 1kg in every inch square.

Lift each board to judge the total weight, or if you are still not sure which is heaviest, weigh the boards.

The result will help you answer your own question.

I think Lyn's proposed test of the 1 inch square versus the 1 meter square, equally buttered and tested with the OP's backside offers the clearest demonstration, surely a memorable demonstration for any ass-piring engineer.

Re 22. Yes you are right. I mucked it up anyway. The first board should have been 1 metre square. Senior moment.

You mis-inferred the question, I hope.

Spread 1 KG of butter over 1 sq. inch. Then spread 1 KG of butter over 1 sq. meter.

Same mass of butter in both cases.

"A lot of times in politics you have people look you in the eye and tell you what's not on their mind." --George W. Bush, Sochi, Russia, April 6, 2008

Hello Lyn. Yes. I mucked it up.

You evidently have a problem understanding the English system vs the SI system of measurement,because you have mixed them in your question.

I will attempt to explain:

1 Inch=25.4 mm.

1 Meter=39.37 inches

Thus: I square meter=15499.969 square inches(approximately)

The TOTAL pressure in each case is the same,but the PRESSURE PER UNIT OF AREA is different,obviously,by factor of 15499.969 to 1.

Interestingly,the most extreme pressure per unit of area that you are likely to encounter (outside of a special lab environment designed to make artificial diamonds) can be found in a Swiss watch movement mechanism.

The total weight of the moving parts is small, but the contact area of the jeweled bearings is nearly microscopic.

This is why they use jewels as bearings(Ruby,Sapphire,and even Diamond in some).

Better now?

Pressure is FORCE/Area which is what the op is asking about. Pressure/Area makes no sense in ths context.

post removed due to lack of interest

The OP makes no sense in any context.

It is a good idea to know what the Imperial system of measurement is compared to the Metric System of measurement......................then, as pointed out you will not mix the units...........never the twain shall meet.............and, you had better believe it!!!!

Maybe this will help... Maybe not...

If your tires have been inflated to a PRESSURE of 30 lbs/square inch, that means every square inch (each little 1" x 1" square) has a FORCE of 30 pounds pushing on it... Therefore, a 10" x 10" area (100 square inches) has a total FORCE of 3000 lbs pushing on it (30 lbs per sq inch x 100 sq inches).

Pressure equals force per unit of area. Force equals pressure x area. Watch the units.

Incidentally, a Kg is a measure of mass, not force. But let's not confuse this discussion by worrying about the difference between force and mass.

This discussion has already been confused ad nauseam.

I agree, Lyn. I'm not even sure this question was sincere. I sort of hope not. This sort of thing should have been learned by 8th grade.

I taught evening classes in math, physics & entry-level engineering at a local community college for several years. Looking back on it, my primary claim to fame was probably my willingness to treat dumb questions like they weren't dumb questions. That's not always easy.

You'll get plenty of practice here.

Did ya hear the one about explosive bolts? Free Body Diagram of a Payload Fairing

Regarding explosive bolts and free-body diagrams.... Incredible.

I could come up with a few more adjectives, but they would be censored.

Can I use a mixed metaphor here?

You are better off using a mixed drink there. Metaphors have a habit of creating headaches for others. However, I vote go for it.

Agreed, you start mixing metaphors and before long you'll be up a gum tree without a paddle.

Or we end up wandering into metaphorgotten territory: http://tvtropes.org/pmwiki/pmwiki.php/Main/Metaphorgotten

He buttered his bread, now he can lie in it!

Metaphors butter no pressure quips.

Are you offering the metaphor?

How do you keep an idiot in suspense.

Tell me next week?

My lady friend called me to meet her at the cafe for a chat, it was all small talk. I don't know what I metaphor!

I was thinking "A mans reach should always exceed his grasp."

I would guess we have actually not helped harshitpatel in his question but rather, improved his sense of humour. (if that is his real handle).

1 Bar air pressure is 14.8lbs

1Kg air pressure is 2.2lbs pressure (approx)

1kg Dropped on your foot exerts a lot of pressure on your toes.

This may help the lad as his question was related to pressure, which actually is a force. If it was not a force, your tyres would fall off your car. E Ba gum! (Mugabe).

Atmospheric pressure is the force per unit area exerted on a surface by the weight of air above that surface in the atmosphere of Earth (or that of another planet). In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point.

I think harshit is beyond help.

I was overcome with an overwhelming act of kindness toward my fellow man. I reached out, offered a helping hand. I admit, is was random. A moment of weakness, (a sign of aging), and to make a better world, for all.

With the right guidance, we can save the world and humanity. The alien invasion can be thwarted. Let us unite our forces, stand together........and have a BBQ, a few beers, chat about cars, women, sports, fishing and CR4 stuff. No pressure, no force on anyone to participate. People may arrive en mass and not a square meter of space would be open, and no doubt, no one would give an inch at the bar. Pascal, the barman, would be busy. All cooking would be left to Jules and his SI Unit waiters. It could be an imperial day with a metric of guests.

Don't ask, it was begging for it!

And may the world be a better place for your effort.

DILLIGAF?

Stop after 1KG/. That is the pressure regardless of the area, in2, m2 or mile2. The resulting forge changes, but the pressure is still 1KG. -- JHF

The pressure is 1 kg?

Somehow, I don't follow... That's sort of like saying the volume is 1 inch.