天冷了,妈妈要给我换厚被子。我主动给妈妈当小助手。当我打开柜子取被子的时候,发现原来蓬松的被子被压得扁扁的,装在一个个塑料袋里,整齐地摞在一起。原来只能放两床被子的柜子里,居然能多放了几床。妈妈说,这是利用大气压力来实现的。装棉被的袋子叫真空压缩袋。把被子放进压缩袋后,通过抽气 When it’s cold, my mother will give me a thick quilt. I take the initiative to give my mother a small assistant. When I opened the quilt and quilt, I found that the fluffy quilt was pressed flat, packed in plastic bags, neatly stacked together. The original can only put two quilts cabinet, actually can put a few more beds. Mother said that this is the use of atmospheric pressure to achieve. The quilt bag is called a vacuum compression bag. After the quilt into the compression bag, through the exhaust