Does altitude affect hydro readings?

[r8rphan]

Just wondering if the fact that I live at 4200' affects the reading I take with my hydro..

I mean there's less pressure pushing on the liquid but the same amount of earths gravity, so I'm now wondering if maybe my efficiency isn't as bad as I thought...

grasping at straws....

 

[bob1852]

keep grasping; I'm at 7,000'....



(honestly, I've never seen this topic discussed; obviously lots about boiling temp, but I haven't seen anything about hyrdo readings at elevation....good question)

 

[chip82]

i believe if you measure some water and it comes to 1.000 on the hyrdo, then their isn't a difference....this is an assumtion, not a proven fact

 

[bob1852]

i believe if you measure some water and it comes to 1.000 on the hyrdo, then their isn't a difference....this is an assumtion, not a proven fact

Yeah, I don't know why I didn't think of that

At 7,000', but hydro still reads 1.000 with distilled water at 60*F...

 

[Mongrel]

Yeah, I don't know why I didn't think of that

At 7,000', but hydro still reads 1.000 with distilled water at 60*F...

My tap water at 3,500' reads the same

 

[mateomtb]

8,500' here, 1.000 with distilled water at 60.

http://en.wikipedia.org/wiki/Elevator_paradox_%28physics%29

"Essentially, a hydrometer measures specific gravity of liquids independent of barometric pressure. This is because the change in air pressure is applied to the entire hydrometer flask."

 

[Inodoro_Pereyra]

Hydro readings are affected by temperature (as we all know), but not by altitude.
A hydrometer works by comparing its own mass with the mass of the liquid it displaces. True, the liquid it displaces is lighter at a higher altitude, but so does the hydrometer, but their mass doesn't change.
Put more graphically, if you were to weigh both, the hydro and the liquid with a digital scale, that measures the force exerted against an internal spring, they'd be lighter the higher you go, but if you weighed them with a balance (http://http://en.wikipedia.org/wiki/Weighing_scale#Balance), their "weight" will not change.

 

[eastoak]

Hydro readings are affected by temperature (as we all know), but not by altitude.
A hydrometer works by comparing its own mass with the mass of the liquid it displaces. True, the liquid it displaces is lighter at a higher altitude, but so does the hydrometer, but their mass doesn't change.
Put more graphically, if you were to weigh both, the hydro and the liquid with a digital scale, that measures the force exerted against an internal spring, they'd be lighter the higher you go, but if you weighed them with a balance (http://http://en.wikipedia.org/wiki/Weighing_scale#Balance), their "weight" will not change.

gracias, inodoro. lol.

 

[Inodoro_Pereyra]

Glad I could help.