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>> it's also useful that 1 bar ~= 10 metres of water for quick estimations.
>
> I didn't quite understand that.
It's useful for quick estimations involving water (one of the most common
pressurised fluids you come across) because it's a multiple of 10.
eg a water tank 4 metres above the tap, pressure at the tap is 0.4 bar.
or, 2 bar coming into your house, what's the pressure at the valve in your
roof 6 metres up? 1.4 bar
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scott <sco### [at] scott com> wrote:
> >> it's also useful that 1 bar ~= 10 metres of water for quick estimations.
> >
> > I didn't quite understand that.
> It's useful for quick estimations involving water (one of the most common
> pressurised fluids you come across) because it's a multiple of 10.
> eg a water tank 4 metres above the tap, pressure at the tap is 0.4 bar.
> or, 2 bar coming into your house, what's the pressure at the valve in your
> roof 6 metres up? 1.4 bar
You mean that when you dive, each 10 meters of depth adds approximately
1 bar of pressure?
--
- Warp
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> You mean that when you dive, each 10 meters of depth adds approximately
> 1 bar of pressure?
Yes, that too.
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scott wrote:
> See the other thread about Andrew's heating system, it's also useful
> that 1 bar ~= 10 metres of water for quick estimations.
Yes, that's the only place I've encountered the term.
IIRC, a "bar" was picked as a "bar of mercury", i.e., one atmosphere? Except
then normalized to nearby SI units?
--
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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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?
No, it is not a unit of mass:
http://en.wikipedia.org/wiki/Slug_(mass)
Regards,
John
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>> See the other thread about Andrew's heating system, it's also useful that
>> 1 bar ~= 10 metres of water for quick estimations.
>
> Yes, that's the only place I've encountered the term.
In the UK I've seen it on any appliance that is connected to the mains water
or gas, also it's mentioned on tyres and pumps, but most people use psi
still for that. Here in Germany bar is used for everything, you don't want
to be setting the electric tyre pump at the gas station to 24 bar by mistake
:-)
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Warp <war### [at] tagpovrayorg> writes:
> scott <sco### [at] scottcom> wrote:
>> >> it's also useful that 1 bar ~= 10 metres of water for quick estimations.
>> >
>> > I didn't quite understand that.
>
>> It's useful for quick estimations involving water (one of the most common
>> pressurised fluids you come across) because it's a multiple of 10.
>
>> eg a water tank 4 metres above the tap, pressure at the tap is 0.4 bar.
>
>> or, 2 bar coming into your house, what's the pressure at the valve in your
>> roof 6 metres up? 1.4 bar
>
> You mean that when you dive, each 10 meters of depth adds approximately
> 1 bar of pressure?
Yep. Pressure in a liquid is h*g*density (g being 9.8 m/s^2 in most
places).
Since water has a nice density, it works out approximately (take g to be
10).
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John VanSickle <evi### [at] hotmailcom> writes:
> 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?
>
> No, it is not a unit of mass:
That's what I thought, till I looked it up.
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On 09/07/2010 11:42 AM, Invisible wrote:
>
> Aye.
>
> (Or should that be "i"?)
Nae, aye.
--
Best Regards,
Stephen
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On 7/8/2010 9:49 AM, Tim Cook wrote:
>
http://www.helium.com/items/1882339-doomsday-how-bp-gulf-disaster-may-have-triggered-a-world-killing-event
Just glanced at the article... it smacks of "Oh my god teh world is
going to end!!!111eleven11one!!!111eleventyone
--
~Mike
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