Question

Acid battery hydrometer is used to measure the specific gravity of an acid. Is this statement True or False
(A) True
(B) False

Answer 1

Hint A hydrometer works on the Archimedes Principle, which states that if a solid is suspended in a fluid, it experiences a force acting upwards. The magnitude of this force is equal to the weight of the fluid displaced by the submerged section of the solid.

Complete Step by step solution
Hydrometer is a device that is used to measure the relative density of liquids, it can also be calibrated such that it can measure the specific gravity of a liquid.
An acid-battery hydrometer can be used to determine the specific gravity of the sulfuric acid present in lead-acid batteries at a certain temperature. This in turn tells us the concentration of the sulfuric acid in the battery.
The acid battery hydrometer is used to measure the state of charge of lead-acid batteries used in the automobile industries.
Lower the concentration of the sulphuric acid, more discharged the battery is.
Therefore the statement made in the question is true.

Option (A) is correct.

Additional information-
A Battery hydrometer consists of a sealed hollow glass tube which has a bulb on its bottom filled with mercury to provide stability. The test liquid is poured inside a measuring cylinder and the hydrometer is generally lowered into the liquid and allowed to float freely. The point at which the liquid touches the stem tells the specific gravity of the liquid.

Note To make an accurate measurement of the battery’s charge with a hydrometer, the temperature should be kept in mind. The reading of a battery hydrometer is calibrated in such a way that it can tell the specific gravity of sulfuric acid at a given temperature only. This temperature is generally equal to$16^\circ C$, at any other temperature the values displayed by a hydrometer need to be adjusted accordingly.