Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe. The increased pressure can directly be transformed into mechanical energy.
Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.