Question

Asperities are microscopic peaks and valleys on

Answer 1

Answer:

On a surface.

Explanation:

Asperities are microscopic peaks and valleys on a surface. This simply means that, when asperities contacts, surfaces also make contact. Asperities are the roughness or unevenness of a surface coming in contact during wear or friction.

Answer 2

Answer:

Surfaces presumed to be smooth

Explanation:

Asperity is an area that exhibit surface unevenness or roughness which consists of surface peaks and valleys that are present in  microscopic level on even very smooth. In lubrication, as the major part of the lubricated surfaces are kept apart by the lubricating layer, asperities are able to come in contact with other asperities .

Surfaces, presumed to be smooth actually contains peaks and valleys, observable on a microscopic scale, known as asperities.