atomicadditions-1.21.1-1.0.0.jar is a release file of the Minecraft mod Mekanism: Atomic Additions for Forge, made for Minecraft 1.21.1. It was published on October 15, 2026 and is 4.6 MB in size. For the full description, screenshots and every other version, visit the Mekanism: Atomic Additions mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
