How to pronounce “collisional” in English

In India, only a couple of places-- at least, I know only one place where this work is going on, but it needs to be done, I think,And so these collisional forces exist.

The other is measuring the atmosphere or exosphere.It's a collisionalist atmosphere.So it's a boundary layer exosphere around the moon.

And he's published a big catalog.The stars are what we call non-collisional.