Dynamic compressors impart velocity energy to continuously flowing air or gas by means of impellers rotating at very high speeds. The velocity energy is changed into pressure energy both by the impellers and the discharge volutes or diffusers. Examples of positive dynamic compressors are:
Compressor lubricants may be mineral or synthetic and of varying viscosity. These lubricants should be able to:
Boyle's gas law, expressed as PV=nRt, states that if the temperature is held constant the product of pressure and volume are inversely proportional. This means if the volume of a cylinder id halved the pressure is doubled.