<span>something that produces or tends to produce torsion or rotation; the moment of a force or system of forces tending to cause rotation.
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The most common is usually lead found in the glass or some circuits in rare cases
Never add tap water to your battery. ... Battery electrolyte levels should be just below the bottom of the vent well, about ½ - ¾ inch above the tops of the separators. Never let the electrolyte level to drop below the top of the plates.
Hard Disk Drive
Solid State Drive
And Random Access Memory (RAM)