daily life example of isochoric process
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Isochoric means occurring at a constant volume.
When a gas takes in or gives up heat in a rigid container of fixed volume, in, for example, an air conditioner, this would be an isochoric process.
Another very famous historical isochoric process occurred in 1938, observed by the DuPont chemist, Roy Plunkett. He was curious about the lack of gas coming out of his fixed volume tetrofluoroethylene cylinder, even though the cylinder’s weight indicated that it was not empty. He sawed the cylinder in half and found that the gas had been catalytically converted by the rust on the inside of the cylinder into a slippery white polymeric substance coating the inside of the cylinder. Plunkett called the new substance, obviously, polytetrafluoroethylene. DuPont marketed this new substance as Teflon.
Some folks have mentioned a pressure cooker before any steam release, as an isochoric process. This is not quite isochoric process, because as the pressure cooker heats up, it also expands. There are many fewer common processes which are as close to being isochoric as the processes we’ve already mentioned which are close to being isobaric, because of thermal expansion. A steel pressure cooker may expand a half percent or so in heating up from room temperature to the boiling point of water. Whether you consider this isochoric or not depends on how fussy you are and how accurate your other measurements need to be.
Many common thermal cycles, for example the Otto cycle which characterizes most internal combustion engines, have approximately ischoric processes as one or more parts of the cycle. When you examine them in detail, of course, they often deviate from truly isochoric processes.
When a gas takes in or gives up heat in a rigid container of fixed volume, in, for example, an air conditioner, this would be an isochoric process.
Another very famous historical isochoric process occurred in 1938, observed by the DuPont chemist, Roy Plunkett. He was curious about the lack of gas coming out of his fixed volume tetrofluoroethylene cylinder, even though the cylinder’s weight indicated that it was not empty. He sawed the cylinder in half and found that the gas had been catalytically converted by the rust on the inside of the cylinder into a slippery white polymeric substance coating the inside of the cylinder. Plunkett called the new substance, obviously, polytetrafluoroethylene. DuPont marketed this new substance as Teflon.
Some folks have mentioned a pressure cooker before any steam release, as an isochoric process. This is not quite isochoric process, because as the pressure cooker heats up, it also expands. There are many fewer common processes which are as close to being isochoric as the processes we’ve already mentioned which are close to being isobaric, because of thermal expansion. A steel pressure cooker may expand a half percent or so in heating up from room temperature to the boiling point of water. Whether you consider this isochoric or not depends on how fussy you are and how accurate your other measurements need to be.
Many common thermal cycles, for example the Otto cycle which characterizes most internal combustion engines, have approximately ischoric processes as one or more parts of the cycle. When you examine them in detail, of course, they often deviate from truly isochoric processes.
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Isobaric means occurring at a constant pressure.
Isochoric means occurring at a constant volume.
Isobaric first.
Most real life thermal or chemical processes, like boiling water on a stove, lighting a match, or the solid moth ball in your linen closet sublimating into an insect repelling gas, take place in contact with a very large, very difficult to change pressure reservoir, with a more or less constant pressure, our local piece of the earth’s atmosphere. These processes are very close to being isobaric.
A nuance: there are changes in the earth’s atmospheric pressure, often bearing with them changes in the weather, but generally they happen slowly enough so that your boiling water for pasta can be considered an isobaric process.
Isochoric next.
When a gas takes in or gives up heat in a rigid container of fixed volume, in, for example, an air conditioner, this would be an isochoric process.
Another very famous historical isochoric process occurred in 1938, observed by the DuPont chemist, Roy Plunkett. He was curious about the lack of gas coming out of his fixed volume tetrofluoroethylene cylinder, even though the cylinder’s weight indicated that it was not empty. He sawed the cylinder in half and found that the gas had been catalytically converted by the rust on the inside of the cylinder into a slippery white polymeric substance coating the inside of the cylinder. Plunkett called the new substance, obviously, polytetrafluoroethylene. DuPont marketed this new substance as Teflon.
Some folks have mentioned a pressure cooker before any steam release, as an isochoric process. This is not quite isochoric process, because as the pressure cooker heats up, it also expands. There are many fewer common processes which are as close to being isochoric as the processes we’ve already mentioned which are close to being isobaric, because of thermal expansion. A steel pressure cooker may expand a half percent or so in heating up from room temperature to the boiling point of water. Whether you consider this isochoric or not depends on how fussy you are and how accurate your other measurements need to be.
Many common thermal cycles, for example the Otto cycle which characterizes most internal combustion engines, have approximately ischoric processes as one or more parts of the cycle. When you examine them in detail, of course, they often deviate from truly isochoric processes.
Isochoric means occurring at a constant volume.
Isobaric first.
Most real life thermal or chemical processes, like boiling water on a stove, lighting a match, or the solid moth ball in your linen closet sublimating into an insect repelling gas, take place in contact with a very large, very difficult to change pressure reservoir, with a more or less constant pressure, our local piece of the earth’s atmosphere. These processes are very close to being isobaric.
A nuance: there are changes in the earth’s atmospheric pressure, often bearing with them changes in the weather, but generally they happen slowly enough so that your boiling water for pasta can be considered an isobaric process.
Isochoric next.
When a gas takes in or gives up heat in a rigid container of fixed volume, in, for example, an air conditioner, this would be an isochoric process.
Another very famous historical isochoric process occurred in 1938, observed by the DuPont chemist, Roy Plunkett. He was curious about the lack of gas coming out of his fixed volume tetrofluoroethylene cylinder, even though the cylinder’s weight indicated that it was not empty. He sawed the cylinder in half and found that the gas had been catalytically converted by the rust on the inside of the cylinder into a slippery white polymeric substance coating the inside of the cylinder. Plunkett called the new substance, obviously, polytetrafluoroethylene. DuPont marketed this new substance as Teflon.
Some folks have mentioned a pressure cooker before any steam release, as an isochoric process. This is not quite isochoric process, because as the pressure cooker heats up, it also expands. There are many fewer common processes which are as close to being isochoric as the processes we’ve already mentioned which are close to being isobaric, because of thermal expansion. A steel pressure cooker may expand a half percent or so in heating up from room temperature to the boiling point of water. Whether you consider this isochoric or not depends on how fussy you are and how accurate your other measurements need to be.
Many common thermal cycles, for example the Otto cycle which characterizes most internal combustion engines, have approximately ischoric processes as one or more parts of the cycle. When you examine them in detail, of course, they often deviate from truly isochoric processes.
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