PhysEx (Water Physics Overhaul)
PhysEx changes how water and other fluids move in Minecraft Java Edition, adding flow rules that behave more like real fluid physics.
What it does
Fluid behavior is the core of the mod: water spreads and flows in a more realistic way, and placed blocks can displace or destroy the water around them. Pistons push fluid out of their path, and hollow blocks can hold water inside them. Water can also evaporate on contact with lava, a behavior that can be set in the config.
Several everyday interactions change with the mod. Glass bottles draw water from a source, farmland can consume water in the same way, and dripstone can fill cauldrons, with the farmland and dripstone behaviors adjustable in the config. Doors and other openings can create air pockets, so the water around them no longer fills every gap.
PhysEx is open source under the GNU General Public License v3.0 only. It needs SKDS Core on both loaders. Files are published for Fabric and Forge, covering the 1.16.5 and 1.21.11 game versions, and the latest Fabric file is 2.0.0 for 1.21.11. The mod runs on the client and the server, so both sides need it.
Key features
More realistic fluid flow
Water spreads and flows with rules closer to real fluid physics than vanilla behavior.
Block placement affects water
Placing or removing blocks can displace or destroy the water next to them.
Piston displacement
Pistons push fluid out of the space they move through, so water responds to moving blocks.
Configurable evaporation and consumption
Water can evaporate near lava, and farmland and bottles can consume water, with options set in the config.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Players and server owners who want water to behave less like vanilla and more like a physical fluid, and who are willing to set the config options that adjust farmland, dripstone and evaporation.
How it compares
Realistic Explosion Physics is a Forge mod for 1.12.2 – 1.20.6, with All rights reserved licensing and not open source; it works on both client and server. Simple Block Physics is a Forge and NeoForge mod for 1.20.1 – 1.21.1 under the MIT License, open source, and also runs on client and server. Simple Block Physics Fabric is a Fabric mod for 1.21.11 – 26.2 under the MIT License, open source, and it can run on a client or a server with the environment marked optional.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| PhysEx (Water Physics Overhaul) | Fabric and Forge | 1.16.5 – 1.21.11 | Client and server | 2026-08-17 |
| Realistic Explosion Physics | Forge | 1.12.2 – 1.20.6 | Client and server | 2024-06-16 |
| Simple Block Physics | Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2025-09-27 |
| Simple Block Physics Fabric | Fabric | 1.21.11 – 26.2 | Client or server, optional | 2026-08-22 |
Questions
Does PhysEx need another mod to run?
Which loaders does PhysEx support?
Does the server need PhysEx?
In the catalog
PhysEx (Water Physics Overhaul) is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 19,862 mods support Minecraft 1.21.11.
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Official listing
- Modrinth page
- modrinth.com/mod/physex_reborn
- Owner
- Sasai_Kudasai_BM
- Published
- 2023-11-13
- Updated on Modrinth
- 2026-08-17
- Facts verified
- 2026-10-15