Question

Define hardness. What are its units and give relationship between these units?​

Answer 1

Answer:

Hardness is the resistance of a material to localized deformation. The term can apply to deformation from indentation, scratching, cutting or bending. In metals, ceramics and most polymers, the deformation considered is plastic deformation of the surface.

FOLLOW ME

MARK BRAINLIEST

Answer 2

Answer:

mol has approximately 6.023 x 10^23 ions. ... So one way to measure hardness is in mol/L or mmol/L. Other common units are milligrams per liter (mg/L), grains per gallon (gpg) or parts per million (ppm). Parts per million just means how many ions of calcium or magnesium you have in a million molecules of water

Explanation:

Most commonly used units include grains per gallon (gpg), parts per million (ppm), and milligrams per liter (mg/L).