It is how many steps back you are from the object that is receiving the sound
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You measure the sound pressure with a sound pressure level meter (SPL meter).
Blend is one I use frequently. It isn't as sophisticated but it is easy to visualize and doesn't sound so haughty.
Yes. The A has a short A sound as in bat and cat.
the sound would be called "ultrasound"
Yes, mop is a short vowel sound.