Final answer:
Pin-stream nozzles are utilized in applications needing focused streams, as in entrainment devices like Bunsen burners and ink jet printers for precise ink placement.
Step-by-step explanation:
A pin-stream nozzle is typically used in applications that require a focused and precise stream of liquid or air. Such nozzles are integral to devices that operate based on principles such as Bernoulli's principle. Common applications for pin-stream nozzles include entrainment devices like Bunsen burners, atomizers, paint sprayers, carburetors, common aspirators, and the chimneys of water heaters.
Additionally, pin-stream nozzles are fundamental in ink jet printers, where they create a fine spray of charged ink droplets for precise placement on paper to form text and images.