tom wrote in news:bv48d8$b7e$1$ snipped-for-privacy@news.demon.co.uk:
If I can remember from my school days, it measures specific gravity, i.e. the density of the acid in the battery, which gives an indication of it's "strength". So presumably sulphuric acid has a different specific gravity to water. Now, did I get that right?
Derry
When you charge the battery the chemicals dissolved in it change & change the density of the electrolyte in the battery.
hydrometer n. instrument measuring specific gravity and density of liquids. hydrometric(al), a. hydrometry, n.
that thing that tests the cells in yer battery. thanks, tom
And I think it's spelt hygrometer, but I don't know why.
Stuart
It has some form of float which will settle at a different height depending on the Specific Gravity of the liquid it's floating in. This SG changes according to the state of charge of the battery. But these days electronic equipment can give the same end result rather less messily.
No, a hygrometer measures changes in humidity.
Robin
That measures humidity. A hydrometer measures specific gravity (or density, if you prefer).
A hydrometer measures the density of liquids, a hygrometer measures the amount of moisture in the air
Ahhhhhh !!!!!!!!! thanks for that !!!!!!
Stuart
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