Word forms: plural diagnoses. variable noun. Diagnosis is the discovery and naming of what is wrong with someone who is ill or with something that is not working properly. I need to have a second test to confirm the diagnosis. Symptoms may not appear for some weeks, so diagnosis can be difficult.
Definition - What does Copper Corrosion mean? Copper corrosion is the corrosion of materials made of copper or copper alloys. With exposure to atmosphere, copper oxidizes, causing bright copper surfaces to tarnish. After a few years, this tarnish gradually changes to dark brown or black, and finally to green.
There are three different types of pipe material that may require replacement: â¢ 1 Copper pipe can fail due to corrosive water or soil, defective pipe material, or poor installation. â¢ 2 Galvanized steel pipe, like in the photo above, has an average lifespan of 40 to 50 years, although it can sometimes last much longer.