Flash definition: A flash is a sudden burst of light or of something shiny or bright. | Meaning, pronunciation, translations and examples. Abstract: Short tube restrictors are commonly used as expansion devices in refrigeration and heat pumping systems. Flashing flow through short tubes is choked, i.e. independent of downstream conditions. Flow rate is typically predicted by empirically correcting the flow rate of compressed liquid from upstream pressure to. Floaters are more common than flashes, and look like small, dark spots or strands that appear to float in front of your eyes. Floaters are very common and are normally harmless. They are more common if you are short-sighted or as you get older. Some people notice they see flashes of light. These can be due to movement.