Final answer:
Contaminants are often introduced to the system through poor installation, leading to pollution of the environment. Water pollution happens when harmful substances enter water bodies and can come from various sources, including industrial, agricultural, and natural events. Proper installation and maintenance are vital for preventing contamination.
Step-by-step explanation:
Contaminants can be introduced to a system through various means, including service practices, compressor failure, and poor installation. The introduction of contaminants into an environment at levels that cause damage is referred to as pollution. This can involve the contamination of air, water, or soil with potentially harmful substances that can adversely affect human health and the environment. Pollution can cause irreversible damage once certain levels of contaminants are reached, and these contaminants can arise from residential, commercial, and industrial sources, or even from natural events. Water pollution occurs when harmful substances enter water bodies, which might stem from point sources like factories or nonpoint sources such as agricultural runoff. Ensuring proper installation practices and routine maintenance can help prevent the introduction of pollutants into systems and environments.