Question

what are different type off hardness? how can we remove them​

Answer 1

According to the different test methods, there are three types of hardness:

• Scratch hardness
• Indentation hardness
• Rebound hardness a

and the 4 commonly used hardness including:

• Brinell hardness
• Rockwell hardness
• Vickers hardness
• Leeb hardness

Answer 2

There are two types of hardness

1-Permanent hardness

2-Temporary hardness

Permanent hardness can be removed by addition of washing soda.

Temporary hardness can be removed by boiling.