Why does gravity have a lesser than grater effect on higher altitudes?

The strength of the gravitational force between two objects depends on the distance between their centers.  

At higher altitude, the center of the Earth is farther from the center of YOU, so the strength of the gravitational force between those two objects is less.

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molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.