James Dewar (who lived 20 September 1842 – 27 March 1923) chemist and physicist, British inventor of the thermos, and the role of the Dewar that was used with his research is extensive in the liquefaction of gases was also particularly interested in Atomic spectroscopy and molecular, and in these fields for more than 25 years.
Resume,
Born in the city of Kenderdin, Scotland, Sir James Dewar received a higher education at Edinburgh University.
He has a reputation for low temperature work, but has also contributed to chemistry.
In 1875, he became a professor of experimental physics at Cambridge University and became a professor at the Royal Institute of Great Britain in 1877.
Achievement,
Dewar studied specific heats of hydrogen, to which he was credited for obtaining hydrogen in a liquid state, and created the Dewar Flash bottle, known to the public as thermos, to maintain liquid for a long period of constant temperature.
With the help of chemist Sir Frederic Abel, he created a smoke-free powder when it was detonated, known as Cordite. He was awarded the title of Knight in 1904 because of his scientific contributions.
James Dewar (who lived 20 September 1842 – 27 March 1923) chemist and physicist, British inventor of the thermos, and the role of the Dewar that was used with his research is extensive in the liquefaction of gases was also particularly interested in Atomic spectroscopy and molecular, and in these fields for more than 25 years.
Resume,
Born in the city of Kenderdin, Scotland, Sir James Dewar received a higher education at Edinburgh University.
He has a reputation for low temperature work, but has also contributed to chemistry. In 1875, he became a professor of experimental physics at Cambridge University and became a professor at the Royal Institute of Great Britain in 1877.
Achievement,
Dewar studied specific heats of hydrogen, to which he was credited for obtaining hydrogen in a liquid state, and created the Dewar Flash bottle, known to the public as thermos, to maintain liquid for a long period of constant temperature.
With the help of chemist Sir Frederic Abel, he created a smoke-free powder when it was detonated, known as Cordite. He was awarded the title of Knight in 1904 because of his scientific contributions.
Dewar bottle
A dewar bottle is composed of a glass container with a double-empty air plate between them.
The use of a dewar bottle is commonly used in homes, in scientific research and industry to preserve liquids and, in some cases, in solid objects, in a fairly constant temperature.
The dewar bottle can keep the liquid cold or hot for up to three days. It does this by preventing heat exchange between a dewar bottle and the surrounding medium.
The walls of a dewar bottle are usually made of glass because of its poor connection to the temperature.
The walls are painted with an inverted metal, such as silver, to reduce the heat loss with radiance. The near-vacuum between the doubled glass wall causes the heat to decrease the heat transfer by carrying a transportation.
Finally, a dewar bottle is based on a concussion surface and is placed in a metal or plastic preservative container, which provides the air separating the container from the bottle of dewar and an additional buffer.
Dewar made his first bottle in 1892 to help him with his research on gas dilution.
Liquid fuel rocket,
Low temperatures below -150C are obtained in one of two ways: the first allows the liquid voltage liquids to evaporate quickly, and the other allows gases under high pressure ranging from 150 atmospheric pressures to 200 sudden expansion.
This expansion can occur in a zone of lower pressure, and can be carried out in a recipient's drive CD so that the compressed gas starts the engine.
The latter method pays better, but it is harder in practice.
Liquid nitrogen has been obtained from air dilution, and it is widely used in scientific applications that require low temperatures of up to 196CA 77K. Liquid nitrogen can be stored in a special dewar bottle.
Important uses of liquid nitrogen include the production of frozen foodstuffs, their use for the removal of warts, the sperm banks use liquid nitrogen to preserve the gene material, and liquid nitrogen as a starting point for lower temperatures.
The dilution of oxygen gas allowed it to be used as an oxidizer in rocket propellers, such as the engine shown in Figure -2, and was used to provide the necessary oxygen to astronauts as well as divers.
Dilution of natural gas facilitated the process of transporting it to investment centers and using it as fuel, and nuclear research uses liquid hydrogen and liquid helium for the purpose of detecting nuclear particles, and to cool giant magnets that accelerate their fields with nuclear particles.
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