Open System is used to describe a system that loses energy to objects that are not part of the system
In Thermodynamics, a system is defined as the matter and its environment relevant to a specific case of energy transfer. Everything outside of that system is referred to as the surrounds.
The stove, the pot, and the water are all parts of the system while heating a pot of water, for instance. Energy is moved around the system (between the stove, pot, and water).
Systems come in two flavours: open and closed. Any system that allows for the exchange of energy with its surroundings is said to be open. Heat can escape into the air, so the cooktop system is open.
Any system that cannot transfer energy to its surroundings is said to be closed.
In the study of energy, the word "system" is used to describe the matter and its surrounds involved in energy transfers. The surrounds include anything that is external to the system.
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