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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
Loc: NY
Last seen: 5 months, 11 days
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Sea Level Pressure Cooking
#23509510 - 08/04/16 12:56 PM (7 years, 5 months ago) |
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"At sea level, the atmospheric pressure averages 14.7 psi – add 15 psi of pressure generated by the pressure cooker and the food in the cooker is cooking at 29.7 psi of absolute pressure."
Is that statement legit? Found it here.
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Sea Level Pressure Cooking [Re: YaMoonSun]
#23509516 - 08/04/16 12:59 PM (7 years, 5 months ago) |
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Kind of but no. There's a difference between psi and psig.
Our cookers gauges read 0 until they hit 14.7 so if you're on a mountain if your PC still cooks at 15 psi 250F same as it would at sea level. Our gauges subtract atmosphere pressure. The 14.7 isn't counted
On a Mountain your gauge just stays at 0 until the water gets to 212 even if it might start boiling at 205F
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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
Loc: NY
Last seen: 5 months, 11 days
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Re: Sea Level Pressure Cooking [Re: bodhisatta]
#23509530 - 08/04/16 01:05 PM (7 years, 5 months ago) |
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Well, the a website I visited said that at sea level water boils at 212F, so that does that imply that my 15PSI is going to be higher than 240F?
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Sea Level Pressure Cooking [Re: YaMoonSun]
#23509562 - 08/04/16 01:17 PM (7 years, 5 months ago) |
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Uhh what?
If your PC gauge says 15psi it is 250F
At sea level 14.7psi or 0psig(what everyone uses) it boils at 212
On a mountain your PC would read negative numbers if the dial could go under 0 then as you heat it up once it gets the water to 212 your gauge would actually read zero.
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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
Loc: NY
Last seen: 5 months, 11 days
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Re: Sea Level Pressure Cooking [Re: bodhisatta]
#23509605 - 08/04/16 01:28 PM (7 years, 5 months ago) |
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On snap. Well. I decided to skip all the dicking around and just PC'd a variable. If successful there will be a write-up later.
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Sea Level Pressure Cooking [Re: YaMoonSun]
#23509653 - 08/04/16 01:42 PM (7 years, 5 months ago) |
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A write up about what? That you confused how we measure PSI relatively and on most gauges remove the atmosphere pressure of 14.7
For example if you lived in a cave and you were 10,000 feet below sea level your PC gauge would read a number above zero even when it was off the stove. And water would boil above 212
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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
Loc: NY
Last seen: 5 months, 11 days
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Re: Sea Level Pressure Cooking [Re: bodhisatta]
#23509665 - 08/04/16 01:44 PM (7 years, 5 months ago) |
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It's a secret; I'll tell if you I don't make a mess or start a fire.
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Sea Level Pressure Cooking [Re: YaMoonSun]
#23509669 - 08/04/16 01:46 PM (7 years, 5 months ago) |
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Right. PCs don't work differently all the sudden if you happen to live at sea level.
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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
Loc: NY
Last seen: 5 months, 11 days
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Re: Sea Level Pressure Cooking [Re: bodhisatta]
#23509676 - 08/04/16 01:48 PM (7 years, 5 months ago) |
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Quote:
Trusted Cultivator said: Right. PCs don't work differently all the sudden if you happen to live at sea level.
Noted
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2shoes
The anti-agar



Registered: 04/07/11
Posts: 3,124
Loc: Not in a SAB
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Re: Sea Level Pressure Cooking [Re: YaMoonSun]
#23509691 - 08/04/16 01:52 PM (7 years, 5 months ago) |
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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
Loc: NY
Last seen: 5 months, 11 days
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Re: Sea Level Pressure Cooking [Re: 2shoes]
#23509696 - 08/04/16 01:54 PM (7 years, 5 months ago) |
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4 minutes on the clock
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weetsie
unlicensed tub surgeon



Registered: 05/08/11
Posts: 572
Loc: United Kingdom
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Re: Sea Level Pressure Cooking [Re: bodhisatta]
#23509916 - 08/04/16 03:22 PM (7 years, 5 months ago) |
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Quote:
Trusted Cultivator said: Right. PCs don't work differently all the sudden if you happen to live at sea level.
I think the weight will hold more pressure at sea level?
-------------------- Active grow logs: Oysters on Straw Pellets Trade list
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Sea Level Pressure Cooking [Re: weetsie]
#23510388 - 08/04/16 06:14 PM (7 years, 5 months ago) |
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Nope it will always hold (14.7)+15 if you're on a mountain it will be like 13.7+(16) and the gauge will read 15 still and your water still will go to 250f If you're in a cave you're going to be say (15.7)+14 then your gauge reads 15 and you get 250F
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Browser
Learning


Registered: 07/23/12
Posts: 601
Last seen: 1 year, 3 months
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Re: Sea Level Pressure Cooking [Re: bodhisatta]
#23510630 - 08/04/16 07:22 PM (7 years, 5 months ago) |
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Quote:
I think the weight will hold more pressure at sea level?
To confuse matters, the pc pressure is formed by the steam pressure lifting the weight. The weight will be slightly less on a mountain because it is further away from the center of the earth. I found this data....
By one estimate, a person who weighs 150 pounds on the surface of the earth would weigh approximately 149.92 pounds at 10,000 feet above sea level.
Pretty insignificant but it will have a slight effect on the pressure inside the pc if we are splitting hairs.
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weetsie
unlicensed tub surgeon



Registered: 05/08/11
Posts: 572
Loc: United Kingdom
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Re: Sea Level Pressure Cooking [Re: bodhisatta]
#23511541 - 08/05/16 02:08 AM (7 years, 5 months ago) |
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Quote:
Trusted Cultivator said: Nope it will always hold (14.7)+15 if you're on a mountain it will be like 13.7+(16) and the gauge will read 15 still and your water still will go to 250f If you're in a cave you're going to be say (15.7)+14 then your gauge reads 15 and you get 250F
I disagree, the boiling point is always relative to atmospheric pressure, no different in that sense than a pan of water without a lid. A 15lb weight will always be just that, (13.7)+15 up a (very low) mountain and (15.7)+15 in a cave below sea level.
Not likely to be an issue with a 15psi pressure cooker but if you are using a low pressure steamer with a 2lb weight it can be, at just 2000 feet you're going to need to run it a lot longer.
-------------------- Active grow logs: Oysters on Straw Pellets Trade list
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