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This special teapot is comprised of two attached glass shells that encompass a plastic core element and has two main features:
A. energy efficiency:
1. There is a distance between shell and core filled with air that keeps heat from conducting
2. The main core has only one opening functions for filling up the teapot and pouring tea.
B. ease of use:
1. Shells and core element have same axis and can turn around this axis when user raises the teapot because of weight of lower strip two shells remain static but main core turns around the axis with users hand and opening slides against the upper strip and automatically opens.
university of tehran