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Georgia O'Keeffe – Hands (1919) by Alfred Stieglitz. Georgia O'Keeffe – Hands, also known as Georgia O'Keeffe (Hands), is a black and white photograph taken by Alfred Stieglitz in 1919. It is part of a large group of more than 300 photographs that he took of the painter Georgia O'Keeffe, from 1917 prior to their 1924 marriage, through 1937.
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A gas jet, fluid jet, or hydro jet is a nozzle intended to eject gas or fluid in a coherent stream into a surrounding medium. Gas jets are commonly found in gas stoves , ovens , or barbecues . Gas jets were commonly used for light before the development of electric light .
The gas expands adiabatically with low losses and hence high efficiency. The gas accelerates to a final exit velocity which depends on the pressure and temperature at entry to the nozzle, the ambient pressure it exhausts to (unless the flow is choked), and the efficiency of the expansion. [5]
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Both appear black, even though the car on the left is bright red, while the car on the right is actually black. Low-pressure sodium (LPS) lamps have a borosilicate glass gas discharge tube (arc tube) containing solid sodium and a small amount of neon and argon gas in a Penning mixture to start the gas discharge.