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Material preparation: egg shell, white vinegar.
Electromagnetic heaters use electromagnetic induction heating principles to convert electrical energy into thermal energy. First, 50 Hz alternating current is converted into direct current, and then the PFM control circuit converts the direct current conversion to a high-frequency high voltage of 17-30 kHz, and the high-speed changed current is generated through the coil.
When people are close to the fire source, they will feel warm. This is the heat from the fire source. This is the heat radiation. The best way to prevent the heat radiation is to reflect it back with a mirror.
Pour boiling water into the thermos cup and tighten the cork or lid clockwise for 2-3 minutes, then touch the outer surface of the cup body with your hands.
Bento has existed since ancient times, and in modern society, it is more common due to the continuous growth of office workers. A delicious and nutritious bento can not only supplement the body's needs, but also make the mood happy.
What is a good dish to bring for lunch? 3 dishes that are suitable for lunch boxes, not easy to spoil and nutritious!