Food containers should be covered and cooked, or wrapped in plastic wrap and heated. This is especially necessary for foods with low water content. On the contrary, if you don't do this, the food will be dry and hard. Even burnt. As for heating rice, it is best to spray some water on it before heating, and then cover it and cook it. Do you want to cover the special bowl for microwave oven and let it heat up? Our rice tastes soft and tastes better. When cooking hot meals, increase or decrease the time according to the calories. If the fire is big, it is usually enough to turn over a bowl of rice for 2~3 minutes. But it is generally recommended to use medium heat, and the length of time depends on how much food is heated. Do not decide. If a lunch box is full, it usually needs to be heated for more than 5 minutes. Covering food with a lid or plastic wrap will make the food heat more evenly.

Extended data

Microwave (microwave? Oven/microwave oven), as its name implies, is a modern cooking stove that uses microwaves to heat food. Microwave is an electromagnetic wave. The microwave oven consists of power supply, magnetron, control circuit and cooking cavity. The power supply provides a high voltage of about 4000 volts to the magnetron. Under the excitation of the power supply, the magnetron continuously generates microwaves, which are coupled into the cooking cavity through the waveguide system. There is a rotatable agitator near the entrance of the cooking cavity. Because the agitator is a fan-shaped metal, it can reflect microwaves in all directions after rotation, so it can evenly distribute microwave energy in the cooking cavity, thus heating food. The power range of microwave oven is generally 500 ~ 1000 watt.

References:

Baidu encyclopedia-microwave oven