S1: A single device can heat fluids without requiring an electrical element. S6: Because there is no electrical element, there is no risk of fire, so the system is suitable for dangerous environments. P: A heat exchanger transfers heat from the central cavity to an air heater, a water heater or a industrial processor. Q: It has a container like the crank case of a car's engine, which contains the fluid to be heated. R: Compression and friction at the nozzles heat the fluid so that the temperature in the central cavity rises steadily. S: A motor and pulley inside the container turn a rotor wheel, which in turn forces the fluid again and again through narrow nozzles into a central cavity. The proper sequence should be

S1: A single device can heat fluids without requiring an electrical element. S6: Because there is no electrical element, there is no risk of fire, so the system is suitable for dangerous environments. P: A heat exchanger transfers heat from the central cavity to an air heater, a water heater or a industrial processor. Q: It has a container like the crank case of a car's engine, which contains the fluid to be heated. R: Compression and friction at the nozzles heat the fluid so that the temperature in the central cavity rises steadily. S: A motor and pulley inside the container turn a rotor wheel, which in turn forces the fluid again and again through narrow nozzles into a central cavity. The proper sequence should be