system
Given the following post, respond as if you're commenting on Reddit:
human
If the gravitational force linearly decreases to zero as you approach a planet's center, does that mean the region of the highest pressure in a gas giant isn't necessarily the center?

This might be stupid question, but it's something I've been thinking about. I can't wrap my head around how there is any pressure at the center of something if there's no gravitation force there.
gpt
Pressure inside the center of a gas giant isn't due to the gravity felt at that one spot, but by the weight of all the matter surrounding it. For example, the air pressure you feel at sea level is caused by the weight of all the air above you.

Another way to think about it is in terms of potential energy. Consider the planet's center, filled with a high density of molecules. If you were to magically place a box in the center, you would have to clear out room for it by pushing all of those molecules out of the center. As you push the displaced molecules away from the center, they would displace more molecules to make room, etc etc all the way to the edge of space for the planet. In essence, you have slightly increased the radius of the planet by placing a box in the middle, increasing the gravitational potential of all the molecules that had to move slightly further away from the center. The planet resists this increase in potential energy, which the box feels as pressure. Why is this increase in potential energy greatest in the middle? Well, if you put the box halfway to the core of the planet, then the particles below it are not affected. When you put it in the middle, every particle is affected.