Question

write a short note on hardness​

Answer 1

Answer:

Hey dude...

Resistance of a material to deformation, indentation, or penetration by means such as abrasion, drilling, impact, scratching, and/or wear, measured by hardness tests such as Brinell, Knoop, Rockwell, or Vickers.Measure of the quantity of dissolved minerals in water.

Hope it helps you.....