# Does an air column require an antinode at an end to produce a sound?

I have a general understanding of how everything works. I understand standing waves, and the difference between open- and closed-ended tubes.

I understand that for closed-ended tubes, the tube must be in the order of 1/4, 3/4, 5/4 (etc...) of a wavelength in order for the sound to occur. This creates the antinode at the open end.

Likewise, I understand that for open-ended tubes, the tube must in the order of 1/2, 1, 3/2 (etc...) of a wavelength in order for the sound to occur. This creates the antinodes at the open ends.

All my textbooks (and everything I find online) simply says that when the antinodes line up like this, a sound is heard. I get it, but is this the only way a sound is made in these air columns? Why is it that whenever I blow sideways into a bottle (regardless of where the liquid is, or how long the bottle is) I can make a sound? Textbooks seem to simply indicate that a sound is only heard when the antinodes line up with the open ends.

My guess to my answer is: Sure, sounds can be heard at all lengths of tube. However, when antinodes line up at the open-ends, the sound is resonated. Is that correct?