Conditions immediately outside a system are called
Conditions immediately outside a system are called The environment.
There are six main external factors that influence the marketing strategy of a business or organization. Some organizations may perform a SLEPT (social, legal, economical, political, and technological) analysis to obtain information on major external influences on their business.
In a thermodynamic analysis, the system is the subject of the investigation. A boundary is a closed surface surrounding a system through which energy and mass may enter or leave the system. Everything external to the system is the surroundings.
An external environment is composed of all the outside factors or influences that impact the operation of business. The business must act or react to keep up its flow of operations. The system consists of those molecules which are reacting. The surroundings are everything else; the rest of the universe. For example, say the above reaction is happening in gas phase; then the walls of the container are part of the surroundings.