“Gravity” is a global daemon acting with equal strength at any point of the 3D domain.

Affect

With “Force” it takes a little time to display the daemon's full influence and the result is a curved stream of particles. “Velocity” directly affects the particles from the very beginning without any delay or acceleration, and you will get a linear particle stream. “Velocity” is not available for rigid/soft bodies.

Strength

This is the dimension of the gravitational acceleration and it depends on your current location. “Strength" accepts both positive and negative values. The "Strength" parameter is also known as “g”. Here are some value for the most important celestial bodies:

Celestial body	g [ m/s^2 ]	Celestial body	g [ m/s^2 ]
Sun	274.0	Jupiter	24.9
Mercure	3.70	Saturn	11.1
Venus	8.87	Uranus	9.0
Earth	9.81	Neptune	11.4
Moon	1.62	Pluto	0.17
Mars	3.37	Ceres	0.27

Bounded

You can choose from four options to restrict the daemon's scope:

“No” turns on the global unrestricted force.
“Box” restricts gravity to the inside of a box that can be scaled like any other object. Change the shape’s size with the "Scale" parameters of the → "Node" panel or the R key.
“Plane” enables a plane in the viewport. The option restricts the effect to the particles at one side of that plane.
“Push” works in a way similar to an engine and is only available with objects.

Underwater

This parameter is only available with the “Push” method from the “Bounded” parameter, and exclusively acts on objects in combination with a → RealWave surface. The force is only applied when the point of action is below the surface. For example, you want to simulate a ship pushed by its propeller, but you do not want it to move when the propeller is above the surface.

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