E1.4.3 – Simplification 3

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  1. Lid is well insulated from the lower part of the tank
  2. Shell well insulated from the room
  3. Lid, gas and fluid at about the same temperature as the room

The energy flow from the contents through the gas-phase and the lid is seen as unimportant and falls out of the picture completely.
The contents is though still connected to the room through the breathing pipe.