December 6, 1945
The microwave oven was invented
On this day, 74 years ago, December 6, 1945 (November 2, 1945 in the lunar calendar) ), the microwave oven was introduced.
Percy Spencer and his invention of the microwave oven.
On December 6, 1945, the microwave oven was invented and protected by patent. A microwave oven is a kitchen appliance that uses microwave radiation to cook and heat food. Currently, the largest microwave oven manufacturer in the world is Galanz.
The idea of ??using microwaves to cook food was first conceived by Percy Spencer of Raytheon, where he built magnetrons for radar equipment. One day while working on an activated radar device, he suddenly realized that the chocolate he had in his pocket had melted. After Percy Spencer's thinking and research, he discovered that his chocolate was melted by microwaves, so he thought that magnetrons could also be used for cooking.
The operating principle of a microwave oven is to irradiate food with microwaves (frequency is usually 2.45 GHz). Food molecules can be divided into polar molecules and non-polar molecules. Under the action of an external electric field, the originally chaotically distributed polar molecules are Molecules turn along the direction of the external electric field, producing steering polarization; nonpolar molecules produce displacement polarization along the direction of the external electric field. When the direction of the external electric field is changed, the direction of the molecule's turn polarization or displacement polarization changes accordingly. When the microwave oven is working, the food placed in the oven is polarized (i.e., swings) back and forth more than 2.4 billion times per second under the action of microwaves (i.e., high-frequency alternating electromagnetic fields). During this time, the collisions between molecules Friction converts electromagnetic energy into heat, so that the internal and external temperatures of the food can rise simultaneously in a very short period of time, achieving rapid heating without destroying the various vitamins and nutrients contained in the food that are beneficial to the human body. It has a bright color, delicious taste, and no inclusions.
Comments: A very practical and convenient household appliance.