Have you ever wondered why a can of compressed air feels like it's freezing when you use it to clean your keyboard? You're not alone. The mystery behind the icy blast from these cans is more intriguing than you might think.
你是否曾在使用压缩空气罐（也称为气体清洁剂）清理电脑键盘时，发现罐子和喷出的气体在一段时间后会变得异常冰冷，甚至罐子上还贴有霜冻警告？这并非没有原因。