No, gravity is not inside us. Gravity is a force that acts around us. Everything in the universe has gravity. I am not sure about stars that weigh negative (e.g -500g) I guess that they would have a reppling force.
Gravity affects all objects regardless of whether they are inside a balloon or not. However, the air pressure inside the balloon might counteract the effects of gravity for a short period, but ultimately gravity will cause the balloon to fall.
how does the gravity free water stay inside the cup
No, but the centre of gravity need not be inside the object. Not unless Gravity is not a variable. But it is not possible for an object to not have a center of mass.
No, the center of gravity of an irregularly shaped object does not have to be located inside the object. The center of gravity is the point where the weight of the object is concentrated, and it can be located both inside and outside the object depending on its shape and distribution of mass.
earth's gravity
gravity
because of unavailability of gravity.
The effect of gravity inside a solid sphere is that it pulls objects towards the center of the sphere, with the force of gravity decreasing as you move towards the surface. This is because the mass of the sphere is concentrated at the center, creating a gravitational pull towards that point.
You keep the phone inside.
Gravity - Lots and LOTS of gravity. Inside the "event horizon" of the black hole, we don't have a clue. We can't see in, and no information can get out.
because of the gravity of the earth inside the popcorn.
closest to the Earths inside like the core