The temperature of the environment surrounding a given point. For example, the air temperature reported by the weatherman is the ambient temperature of the air at the location of the instrument used to measure the air temperature.
The temperature of the air, atmosphere or other fluid that completely surrounds the apparatus, equipment or the workpiece under consideration. For devices which do not generate heat, this temperature is the same as the temperature of the medium at the point of device location when the device is not present. For devices which do generate heat, this temperature is the temperature of the medium surrounding the device when the device is present and generating heat. Allowable ambient-temperature limits are based on the assumption that the device in question is not exposed to significant radiant-energy sources such as sunlight or heated surfaces.
The average temperature of the battery's surroundings.
The temperature of the air or other medium that surrounds the components of a thermal system.
The temperature of the objects (not necessary the temperature of the intake air), surrounding the SMPS.
Generally speaking, the temperature of the air surrounding an object.