Question

Is greater pressure exerted inside the whale's body or outside the blowhole? Explain.

Answer 1

inside the body, there is a lot of pressure seeing as there is a lot of air and water built up in the whale, so that must mean that there is pressure built up in the whale too

Answer 2

Air flows from high pressure to low pressure. So does water.
So do populations of people and animals, but that's another
story.

When you reduce the pressure in your lungs, air flows into them
from outside, and you inhale. When you increase the pressure
in your lungs, air flows out of them to the outside, and you exhale.

I haven't seen a whale in about 30 years, and they may have changed
since then. But the last time I saw some, air and spray were blowing
OUT of their blow-holes. As soon as I saw that, I said to myself:
"Self ! The pressure inside that creature's body must be greater than
the outside atmospheric pressure, and that's why the air is flowing out,
from the higher pressure to the lower pressure."