A short circuit is when a track is cut across a loop, making a smaller loop inside the original loop. As the negative battery terminal of a vehicle is connected to the car body an electrical short circuit is when the electrical wiring insulation is rubbed through on a part of the body allowing the wire to touch the car body and the electricity travels in a shorter circuit. If this happens along the wire after it has left the device, the device will remain on, however if the wire grounds before the device the battery will connect straight to ground it may cause a fire, just like a toaster element glows, the wire will glow melting the plastic insulation along it's length and feed the fire. Generally an electrical fire will travel along the wiring until reaching back to the battery. The fire can also start other short circuits starting more fires, unless the battery can be disconnected quickly, those fires may well burn the entire vehicle.
Water has a Specific Gravity of 1.000 Suphuric Acid has a Specific Gravity of 1.835. By sucking a quantity of solution into the hydrometer, the float raises by the amount of density of the fluid, which can be read from the fluid line against the scale attached to the float. As density is affected by temperature, a quality hydrometer has a scale for temperature correction. Batteries must be checked at 26.7'C for each 5'C above that add 0.004 to the hydrometer. For each 5'C below 26.7'C subtract 0.004 from the hydrometer reading.
A device used to measure voltages, such devices are either single or multiple readout meters. a single unit would be a simple "Volt Meter". A multiple readout meter in commonly called a "Multi Meter"
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