There is a Legacy version here.

Splash

Source GM Core pg. 244 2.0
Some weapons and effects, such as alchemical bombs, have the splash trait. When you use a weapon or effect with the splash trait, you don’t add your Strength modifier to the damage roll. A splash weapon or effect deals any listed splash damage to the target on a failure, success, or critical success, and to all other creatures within 5 feet of the target on a success or critical success. On a critical failure, the weapon or effect misses entirely, dealing no damage. Add splash damage together with the initial damage against the target before applying the target’s resistance or weakness. You don’t multiply splash damage on a critical hit.