What refers to the deterioration of material by oscillatory relative
motion of small amplitude between two solid surfaces in a corrosive
environment?
The percentage of nitrogen in ammonia is _______________%
Ammonia when used directly as a fertilizer is to be injected about_____
under the surface to keep it from seeping out.
What is a method of casehardening involving diffusion in which the
steel to be casehardened is machined, heat treated placed in an air tight box
and heated to about 1000 oF
