They say that non-metals are non -sonorous (does not produce sound).
But wind produces the sound, where air (a mixture of non metals.) under pressure produces a "hooooooooo" sound.
So does this make an exception in the properties of non-metals?

Dear student, When an object vibrates, it causes slight changes in air pressure. These changes in aur pressure travel as waves through the air. As it moves forward in air, it pushes the air in contact with the surface. Due to which a sound is produced. We can say that in applications of pressure in air, tye molecules in air hit tye surfaces around it due to which sound is produced. Regards,