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What is hydrometer in automobile engineering?

Updated: 8/20/2019
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11y ago

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A hydrometer is a device used to determine the density of a fluid, often a solution of water and salt, acid, or caustic. In automobile engineering it is used to determine the strength of battery acid based on its density. If the density of the solution is too low acid needs to be added, if it is too high water needs to be added. The normal reading for a lead-acid battery used in automobiles is 1.2 - 1.3 grams per milliliter. Less than 1.18 the acid needs to be replaced, more than that may indicate a need to replenish the volume with fresh distilled water.

Note: hydrometers read normally at 77 F, temperatures above or below this can give false readings. The battery should be fully charged when taking a reading.

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