Question

10.
Substance used for making surface smooth​

Answer 1

Answer:

plaster of paris is used.

Answer 2

Lubricants used for making the surface smooth :

• A lubricator could be a substance that helps to cut back friction between surfaces in mutual contact.
• Which ultimately reduces the warmth generated once the surfaces move.
• It's going to even have the perform of transmission forces, transporting foreign particles, or heating or cooling the surfaces.
• The property of reducing friction is called lubricity.
• So the lubricants are used for making the surface smooth.