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Re: Describing air flow
I am not quite sure what "harder" air is, but when I talk about air with my students, there are only two things you can change about your air - the speed and the quantity. Speed affects pitch, quantity affects volume. These two variables are independent (otherwise you could not play different dynamics at different ranges).
I use the analogy of putting a thumb over a water hose. You are not changing the valve, so the amount of water is not changing, only the speed of the water is changing. Then we can talk about what makes air faster (smaller aperture and angling of air. If they are ready for it, voicing as well)