A question about ferrotype; is balanced pH and Gravity a synonym?

As a mechanic, I often test batteries for their specific "Gravity" to determine

charge. Batteries are acidic and as the "Gravity" becomes more water like, pH

neutral, it is determined that they have become discharged.

 

Is "Balanced" pH and "Balanced" Gravity the same as neutral? Is there a common

etymology between pondus hydrogenii and gravity?

 

Thanks.

I think gravity refer to the density of the liquid. I'm sure that there is a relationship in some liquids between specific gravity and pH, but I don't think they are automatically linked together. I could be wrong about all of this, of course, but that is what I think.

Gravity, or 'specific gravity' is a measure of the density of the liquid in grammes per millilitre. It does vary with the charge in a battery and thus the concentration of acid, but it is also used to measure the alcohol content of beer, the salt content of sea water and others.

 

I take the term 'balanced pH' to mean that a solution is buffered to stabilise its pH (hydrogen ion concentration) under a range of conditions.

 

They are not necessarily linked.

If you use tap water to mix your developer the pH of the tap water should also be considered.

Chris has it: "gravity" in this context is an old word for density; the "specific gravity" of a liquid is the ratio of its "gravity" to that of water (which is approximately 1 g/ml at room temperature).

Thank You.