30 Examples of Open, Closed and Isolated Systems

Open, Closed and Isolated System

It is called thermodynamic system or system to any set of objects that is convenient to consider as a unit and that can exchange energy with the environment.

In this way, the study of phenomena that occur in a thermodynamic system can be reduced to the analysis of a series of more or less simple variables.

Obeying the degree of isolation that these systems present with respect to their environment, it is possible to recognize three different types:

Examples of open systems

1. The human body. Being in need of matter for energy, the body is an open system that requires of the exchange with the environment of organic and inorganic inputs and energy for its functioning.
2. A pot of boiling water. The energy introduced into the system by the fire transforms the water into gas, which is released into the environment.
3. A bonfire. To keep the fire burning it is necessary to provide the fire with flammable material, for example Coal or dry branches. Without that matter to consume, the fire will go out.
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4. A combustion engine. Motors are complex systems that generate motion from a constant supply of fuel: gasoline, diesel, etc.
5. Most of the plants. The plants They require matter for their subsistence (in the form of water and nutrients) and energy (solar) to carry out vital photosynthesis.
6. A compost bin. The process of compost that produces compost to fertilize crops operates based on the constant introduction into the compost waste organic matter: shells, food scraps, etc. Without them, the degradation processes of the material would stop and so would the production of compost.
7. The saunas. To produce the steam contained in saunas, water (matter) and energy (fire) are required to produce water vapor and allow it to accumulate in the closed room. After a period, the steam will disappear and a new injection of inputs into the system will be needed.
8. A nuclear reactor. The electricity generated by the reactor is the product of the fission of uranium (or other elements) in an atomic reaction controlled that allows to generate a lot of usable energy, but also toxic waste that must go somewhere in the environment.

Examples of closed systems

1. A bottle of cold water exposed to room temperature. As the bottle is closed, the transfer of matter between the system and the environment is impossible: no liquid can enter or exit. However, it is possible to exchange energy: the water will gradually heat up.
2. A thermometer. Since it is hermetically sealed, the content of a thermometer never changes, but it does react according to the temperature that it perceives, that is, it is sensitive to the input of heat (energy).
3. Sun. If the matter that it transforms into energy is neglected, the sun is an example of a closed system, which does not exchange matter with its environment, but does exchange energy (solar radiation, sunlight, heat).
4. Planet Earth. The Earth operates without exchanges of matter with respect to the vacuum that surrounds it or to the other planets and celestial objects, but receives solar energy constantly, without which life would be unlikely.
5. A container with hot food. Hermetically closed, the container will prevent the matter inside from coming out or from entering it, but will still radiate the heat of the food out.
6. TVs. These artifacts work from the consumption of electric power, to emit light of various types and modulations, together with sound waves, to the external environment. But they do not require injection of matter, nor is the mass inside it altered.
7. Pressure cookers. They do not allow the escape of gases generated inside to act on the food by cooking. For this reason, pressure cookers act as closed systems that prevent the escape of matter, but not of the energy that comes out as heat or that necessary to start cooking, also coming from outside.

Examples of isolated systems

1. A safe. The contents in safes are separated by thick hermetic layers of metal from their surroundings, isolated from matter and of energy, at least under normal conditions: if we throw it into a volcano it is sure to melt and incinerate its contents.
2. The wetsuits. The use of these suits protects for a period of time from the heat exchange between the water and the body, and prevents this (matter) from penetrating inside.
3. Thermos. For a certain time, the thermos achieve isolate heat contained in its interior and prevent the leakage and entry of energy and matter.
4. A heat cavity. The cellars operate based on the extreme reduction of heat input, keeping their content cold for a certain period. Once that time range is exceeded, the content will begin to heat up.
5. Igloos of the Eskimos. They are designed in such a way that no heat or matter enters or egresses.
6. A gas cylinder. Contained under pressure inside, the gas is isolated from the matter and energy around it in normal conditions since it is possible that the heating of the cylinder forces the gas to expand and occur a tragedy.
7. The universe. The universe is an isolated system since nothing enters or leaves it, neither matter nor energy.
8. Canned food. Under normal conditions, these foods are far from any exchange of matter or energy. Of course, it would be possible to subject the can to heating or cooling, and even melt it at temperatures extreme, but even for a (brief) moments the food will be completely isolated from the heat.
9. A hyperbaric chamber. Useful for isolating divers with nitrogen bubbles in their blood from atmospheric conditions, the chambers Hyperbaric do not allow the exchange of matter or energy, or at least not in appreciable quantities and significant.