In the first papers, the notation had the "H" as a subscript to the lowercase "p", as so: The exact meaning of the "p" in "pH" is disputed, but according to the Carlsberg Foundation, pH stands for " power of hydrogen". Another suggestion is that the "p" stands for the Latin terms pondus hydrogenii quantity of hydrogenpotentia hydrogenii capacity of hydrogenor potential hydrogen.
November 19, at 7: If you stick a straw in a drinking glass, you'll notice the water level in the straw is the same as the water level outside the straw, regardless of where the bottom of the straw is as long as it's submerged. So you'll always want to measure to the fluid surface, which in this case is at the top of the keg when full and the bottom of the keg when empty, or in the middle of the keg on average.
May 3, at 8: There might initially be a very small headspace in the top of the tube, this will go away once the keg is pressurized and beer starts to flow out. Beer should not flow backwards to allow any gases to collect in the tube between the level of beer in the keg and the faucet.
The fluid level in a drinking straw matches the level in the glass because both have exposure to the same atmosphere. Kegged beer does not. Remove that straw from the glass and seal the top end with your finger, then submerge it again in the same glass; now the fluid level is below the level in the glass which will actually raise!!
Or does it not really matter due to the surface area of the fluid volume in the keg being so much higher than that within the dip tube? May 4, at 3: Here, our two points are in the keg, and then at the exit of the tap.
We ignore everything that happens in between, except frictional losses along the way. We could calculate the energy at any given point in the dip-tube August 2, at 8: I have had terrible trouble with my kegerator getting a proper carbonation level while also dispensing foam-free beer.
I am embarrassed that it has taken me so long to finally break this down into a fluid mechanics problem, considering that I am a mechanical engineer. I think this rule-of-thumb may be a misinterpretation of a more appropriate headloss rate of 3-ft of headloss per ft of length i. This more appropriate rule-of-thumb results in a pressure headloss rate of 1.
The implication of using a headloss rate 1.
I see your assumptions includes a statement about elevation correction not being required. Wouldn't the lower ambient pressure increase the flow rate? Thanks for the calculation August 4, at 5: You might need to adjust your CO2 pressure in the carbonation table to get proper carbonation at 8k ft; however, the gauge reading should be accurate for calculating the hose length.
If you took your empty CO2 tank to get refilled at sea-level, suddenly your gauge pressure would read This now makes sense. August 15, at 4: My guess is multiply the calculated value by 1. But this comment is all based on handwavey assumptions, so try it out and get back to me!
If you tell me all the other variables CO2 pressure, length of tubing, height difference between tap and keg, and time to fill up x volume of beer we can back out a better assumption!
Jake PopeVader Majeski says:A normal vaginal pH level is between and , which is moderately acidic. However, what constitutes a “normal” pH level can vary slightly based on your stage of life.
Niacin Saturation Home. HOW TO DETERMINE A SATURATION LEVEL OF NIACIN Niacin is vitamin B-3, one of the water soluble B-complex vitamins. One of niacin's unique properties is its ability to help you naturally relax and get to sleep more rapidly at night.
Work Environment Measurement. WEM, is the process of determining the level of environmental hazards and its hazardous effects on workers. COUNTRONICS is a manufacturer and supplier of Humidity Meter, Controller, pH Meter, Controller, ORP Meter, Conductivity Meter and Digit Counter.
Effective Teaching of Reading: From Phonics to Fluency Timothy Rasinski Kent State University White Hall Kent, OH , [email protected] Example: Find the pH of a M HCl solution.
The HCl is a strong acid and is % ionized in water. The HCl is a strong acid and is % ionized in water. The hydronium ion concentration is M.