Amicrowave oven cooks with…well， microwaves. What are they，and how do they works?

Well， first， microwaves are a form of energy similar to radio and TV waves.They are sent into the cooking area through openings at the top of the oven. Microwaves reflect off the metal walls of the oven， passing through glass， paper， and microwave-safe dishes.

Microwaves cause water molecules （分子） in food to vibrate（振動(dòng)）， 450 million times per second. As the water molecules vibrate， they rub against each other， producing friction. This friction causes the food to get hot.

Just think how hot your hands would get if you rubbed your palms（手掌） together2，450，000，000 times per second!

微波爐做飯用……對(duì)了，用微波。微波是什么？怎么工作呢？

首先，微波是能量的一種形式，和廣播電視的無(wú)線電波相似。微波通過(guò)微波爐頂部的小孔發(fā)射到烹調(diào)區(qū)，再由爐內(nèi)金屬壁上反射，穿過(guò)玻璃、紙以及可用微波加熱的餐具。

微波能引發(fā)食物中的水分子以每秒24.5億次的頻率振動(dòng)。水分子振動(dòng)著，互相觸碰，產(chǎn)生摩擦。這種摩擦使食物變熱。

只要想想看，如果你每秒摩擦你的手掌24.5億次，你的手該有多熱呀！