A Hydrometer work on the concept of ________. Fill in the blank with the most appropriate. 

Explanation:

Hydrometer:

• A hydrometer or lactometer is an instrument used for measuring the density or relative density of liquids based on the concept of buoyancy.
• Buoyancy is the tendency of an object to float in a fluid.
• All liquids and gases in the presence of gravity exert an upward force known as the buoyant force on any object immersed in them.
• Buoyancy results from the differences in pressure acting on opposite sides of an object immersed in a static fluid.
• They are typically calibrated and graduated with one or more scales such as specific gravity.
• A hydrometer is a device used for measuring some characteristics of a liquid, such as its density (weight per unit volume) or specific gravity (weight per unit volume compared with water).
• The hydrometer makes use of Archimedes' principle: a solid suspended in a fluid is buoyed by force equal to the weight of the fluid displaced by the submerged part of the suspended solid.

Additional InformationRelative humidity:

•  Relative humidity, often expressed as a percentage indicates a present state of absolute humidity relative to a maximum humidity given the same temperature.

Mixing ratio:

• In chemistry and physics, the dimensionless mixing ratio is the abundance of one component of a mixture relative to that of all other components. The term can refer either to the mole ratio or the mass ratio.

Newton's law of viscosity:

• Newton's law of viscosity defines the relationship between the shear stress and shear rate of a fluid subjected to mechanical stress. The ratio of shear stress to shear rate is a constant, for a given temperature and pressure, and is defined as the viscosity or coefficient of viscosity.