Version: 2018.2
public static Vector3 gravity ;

Description

The gravity applied to all rigid bodies in the scene.

Gravity can be turned off for an individual rigidbody using its useGravity property.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { void Example() { Physics.gravity = new Vector3(0, -1.0F, 0); } }

ParticleSystem.gravityModifiers is Obsolete.