Χρειάζομαι μια κάρτα flash για αυτή τη φωτογραφική μηχανή - translation to Αγγλικά
![Demonstration of a magnesium [[flash powder]] lamp from 1909](https://commons.wikimedia.org/wiki/Special:FilePath/1909 Victor Flash Lamp.jpg?width=200 "Demonstration of a magnesium [[flash powder]] lamp from 1909")
![Kodak Brownie Hawkeye]] with "Kodalite Flasholder" and Sylvania P25 blue-dot daylight-type flashbulb](https://commons.wikimedia.org/wiki/Special:FilePath/Brownie Hawkeye with Flash.jpg?width=200 "Kodak Brownie Hawkeye]] with \"Kodalite Flasholder\" and Sylvania P25 blue-dot daylight-type flashbulb")
![A photo of a [[Smith & Wesson Model 686]] firing, taken with a high speed [[air-gap flash]]. The photo was taken in a darkened room, with camera's shutter open and the flash was triggered by the sound of the shot using a microphone.](https://commons.wikimedia.org/wiki/Special:FilePath/Bullet coming from S&W.jpg?width=200 "A photo of a [[Smith & Wesson Model 686]] firing, taken with a high speed [[air-gap flash]]. The photo was taken in a darkened room, with camera's shutter open and the flash was triggered by the sound of the shot using a microphone.")
![[[Ernst Leitz]] Wetzlar flash from 1950s](https://commons.wikimedia.org/wiki/Special:FilePath/E. Leitz Wetzlar flash - 1.JPG?width=200 "[[Ernst Leitz]] Wetzlar flash from 1950s")
![Pentax MZ-30]], firing](https://commons.wikimedia.org/wiki/Special:FilePath/The built in flash of a SLR camera, Pentax MZ-30, firing 2.jpg?width=200 "Pentax MZ-30]], firing")
![Flash LED with [[charge pump]] integrated circuit](https://commons.wikimedia.org/wiki/Special:FilePath/Wiko Rainbow 4G - Flash LED with SGM3140 LED Driver -5572.jpg?width=200 "Flash LED with [[charge pump]] integrated circuit")
Ορισμός
Βικιπαίδεια
Flash evaporation (or partial evaporation) is the partial vapor that occurs when a saturated liquid stream undergoes a reduction in pressure by passing through a throttling valve or other throttling device. This process is one of the simplest unit operations. If the throttling valve or device is located at the entry into a pressure vessel so that the flash evaporation occurs within the vessel, then the vessel is often referred to as a flash drum.
If the saturated liquid is a single-component liquid (for example, propane or liquid ammonia), a part of the liquid immediately "flashes" into vapor. Both the vapor and the residual liquid are cooled to the saturation temperature of the liquid at the reduced pressure. This is often referred to as "auto-refrigeration" and is the basis of most conventional vapor compression refrigeration systems.
If the saturated liquid is a multi-component liquid (for example, a mixture of propane, isobutane and normal butane), the flashed vapor is richer in the more volatile components than is the remaining liquid.
Uncontrolled flash evaporation can result in a boiling liquid expanding vapor explosion (BLEVE).