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Invisible <voi### [at] dev null> wrote:
> "The subterranean methane is pressurized at 100,000 pounds psi.
> According to Matt Simmons, an oil industry expert, the methane pressure
> at the wellhead has now skyrocketed to a terrifying 40,000 pounds psi."
> Who the **** says "pounds psi"?
"Pounds Per Square Inch." Isn't it rather obvious?
--
- Warp
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>> Who the **** says "pounds psi"?
>
> Someone talking to an audience that doesn't know what "psi" means?
Then why not just write "pounds per square inch"? Or just "PSI"? If you
don't know what it means, adding "pounds" doesn't really help.
> What's the metric unit of pressure like this, out of curiousity?
x Pascals = x Newtons/square meter.
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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Stephen <mca### [at] aoldotcom> wrote:
> On 08/07/2010 5:07 PM, Darren New wrote:
> > What's the metric unit of pressure like this, out of curiousity?
> >
> 1 psi equals 6,895 Pascals or N/m^2
Isn't it confusing that "pound" is both a unit of mass and of force?
--
- Warp
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On 08/07/2010 6:28 PM, Warp wrote:
> Stephen<mca### [at] aoldotcom> wrote:
>> On 08/07/2010 5:07 PM, Darren New wrote:
>>> What's the metric unit of pressure like this, out of curiousity?
>>>
>
>> 1 psi equals 6,895 Pascals or N/m^2
>
> Isn't it confusing that "pound" is both a unit of mass and of force?
>
Not to native English speakers.
If you want to differentiate between them then you will say pound-force
(speakers of technical English only).
--
Best Regards,
Stephen
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Warp wrote:
> Stephen <mca### [at] aoldotcom> wrote:
>> On 08/07/2010 5:07 PM, Darren New wrote:
>>> What's the metric unit of pressure like this, out of curiousity?
>>>
>
>> 1 psi equals 6,895 Pascals or N/m^2
>
> Isn't it confusing that "pound" is both a unit of mass and of force?
I believe that "stone" is actually the unit of weight. But given that the
word was likely created before people understood there's a difference, and
given that "pounds" is always the same force in Earth's gravity field, and
given that it doesn't really get used in the scientific field where you wind
up in situations where mass and force are actually important to distinguish,
... no, I don't think so.
So when the instruction book for your car tells you how much pressure to put
in your tires, do they really say "put 206,000 newtons of pressure in your
tires"?
--
Darren New, San Diego CA, USA (PST)
C# - a language whose greatest drawback
is that its best implementation comes
from a company that doesn't hate Microsoft.
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On 08/07/2010 6:34 PM, Darren New wrote:
> Warp wrote:
>> Stephen <mca### [at] aoldotcom> wrote:
>>> On 08/07/2010 5:07 PM, Darren New wrote:
>>>> What's the metric unit of pressure like this, out of curiousity?
>>>>
>>
>>> 1 psi equals 6,895 Pascals or N/m^2
>>
>> Isn't it confusing that "pound" is both a unit of mass and of force?
>
> I believe that "stone" is actually the unit of weight. But given that
> the word was likely created before people understood there's a
> difference, and given that "pounds" is always the same force in Earth's
> gravity field, and given that it doesn't really get used in the
> scientific field where you wind up in situations where mass and force
> are actually important to distinguish, .... no, I don't think so.
>
Just out of interest (possibly) when I was at school we were taught
about the SI units but did our hard sums in pounds-force, foot pounds
and even BTU’s. But as Andrew said, I’m an old guy with grey hair.
> So when the instruction book for your car tells you how much pressure to
> put in your tires, do they really say "put 206,000 newtons of pressure
> in your tires"?
>
Measured in Bars I believe.
--
Best Regards,
Stephen
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Darren New <dne### [at] sanrrcom> wrote:
> So when the instruction book for your car tells you how much pressure to put
> in your tires, do they really say "put 206,000 newtons of pressure in your
> tires"?
I think you are confusing force (newtons) with pressure (pascals), which
is force per unit area.
Things like air pressure are measured in pascals or, more traditionally,
in bars (1 bar = 100 kilopascals), and sometimes (even though rarely
nowadays) in atmospheres (1 atm = 101325 Pa).
--
- Warp
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Warp wrote:
> I think you are confusing force (newtons) with pressure (pascals), which
> is force per unit area.
Yes.
> Things like air pressure are measured in pascals or, more traditionally,
> in bars (1 bar = 100 kilopascals), and sometimes (even though rarely
> nowadays) in atmospheres (1 atm = 101325 Pa).
Ah, thank you. I never really learned what a "bar" was. So one bar is
approximately one atmosphere? That sounds about useful.
--
Darren New, San Diego CA, USA (PST)
C# - a language whose greatest drawback
is that its best implementation comes
from a company that doesn't hate Microsoft.
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> Ah, thank you. I never really learned what a "bar" was. So one bar is
> approximately one atmosphere? That sounds about useful.
See the other thread about Andrew's heating system, it's also useful that 1
bar ~= 10 metres of water for quick estimations.
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On 09/07/2010 8:11 AM, scott wrote:
>> Ah, thank you. I never really learned what a "bar" was. So one bar is
>> approximately one atmosphere? That sounds about useful.
>
> See the other thread about Andrew's heating system, it's also useful
> that 1 bar ~= 10 metres of water for quick estimations.
>
>
Or 1 bar ~= 34 feet of water. (In real money) ;-)
--
Best Regards,
Stephen
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