How the density of the electrolyte is checked?

The density of an electrolyte is typically checked using a hydrometer, which is a device that floats in the liquid and provides a reading based on the level to which it sinks. Alternatively, a refractometer can be used to measure the refractive index of the electrolyte, which correlates with its density. In laboratory settings, the density can also be calculated by measuring the mass of a known volume of the electrolyte using a balance and graduated cylinder. Regular monitoring of density is essential for ensuring optimal performance in applications like batteries.